Hi there,
I have noticed that people are still suspecting many people who are not on Patrick Jane's list or who are confirmed dead.
I would like to clear a few things up and then afterwards discuss my theory and the reasons for it.

First off, regarding people who are not on the list:
Bruno Heller himself has said multiple times that Red John is one of the people on Jane's list. He refers to Red John as a 'he' and has also told people that Patrick Jane is not Red John. Red John cannot be Van Pelt, Lisbon, Jane, or anybody else who is not on the list because Bruno Heller has said so.

Second, regarding suspects who are DEAD:
Brett Partridge is definitely dead as Lisbon and all of us viewers witnessed so he can't be Red John. Him saying Tyger, tyger was either a cry for help or a clue as to his murderer. I highly doubt Red John would do either of those things.
Robert Kirkland is dead as we all saw Reede Smith shoot him multiple times in the back and his body was found dead. Smith later admitted in The Great Red Dragon that he killed him, so Kirkland is not Red John either.
Bret Stiles is dead as confirmed by the people who work on the show and also by the fact that his DNA was found all over the building and there was no tattoo on his shoulder... so he isn't Red John either.
Ray Haffner is also confirmed dead the same way as Bret Stiles. Besides, while he was quite suspicious in the way he tried to transfer Lisbon into his department, he wasn't tough enough nor was he very persuasive. While it is known that he had support from Visualise, he was most likely just a disciple of Red John, nothing more. He also did not have the three red dots tattooed on his shoulder either.
Thomas McAllister has been confirmed dead as well just as Bret Stiles and Ray Haffner. Also, when Jane saw the tattoo on his shoulder, McAllister was afraid and said "It's not what you think." clearly frightened. Red John would not act that way and would already know about the tattoo's significance to Jane.

Now, I think that is about all regarding the subject of the non-suspects, so now to explore what we do know about Red John.

Now, Harker Rosalind may not have met the real Red John, just one of his disciples claiming to be him under orders so as to mislead Jane. Anyway, why would Red John be so foolish so as to make it possible for her to identify him? Why not send in someone else so Jane will have the wrong description? It is possible that the man she slept with was actually Red John but it is important to be careful with what information is to be taken seriously and as truth.
The man who stabbed Kira Tinsley may not have actually been Red John. It is possible that the person she communicated with was a disciple, not Red John himself so her description may be of a different person.
Besides, why would Red John even show anyone that tattoo or make it visible? You would think that if he is going to communicate with or kill someone he doesn't trust, he would either make sure they are completely dead before he leaves or make sure that there is nothing on him that can make him identifiable or linked to anybody else. He should have worn clothing to cover his shoulders.

I think it is likely that in The Great Red Dragon, Red John planted the bomb but positioned himself so as not to be harmed. While they were all gathering into the room he could have planted the bomb in an appropriate place after having a quick look as to the layout of the room. Or he may have arrived earlier and snuck around to watch Jane to see which room it was to happen in and then planted the bomb in a good place somewhere in the house so he won't be harmed seriously. Then he could leave and 'arrive just on time' so Jane won't suspect a bomb.

Now, many people suspect Reede Smith to be Red John but I don't think that he is. My reasons being:
Red John sent in people to kill Reede Smith. Some viewers may think that it is just an act so Jane won't suspect him but they why did the officer say he was going to kill Reede Smith if no one from the CBI was around to hear it? It is clear that Reede Smith was going to be shot if CBI hadn't intervened. And near the end, when Reede Smith is in the alley way dressing his wound and asking Van Pelt for help, he was wary of the car approaching him and hid until he heard that the Cordero was from the CBI but would not drop the weapon until the fake agent Cordero said he came from Van Pelt to help. It is clear that he was going to be shot then until Kimball Cho showed up and saved him. Later when he was being interrogated, he gave a lot of information to Jane and Lisbon that Red John would never want them to know.

MY THEORY: GALE BERTRAM
He is the only suspect on the list left and he doesn't take orders to kill from anyone (well, as far as we can see) and has people who do his bidding. He also has been trying to get all the information he can about Red John from Jane. And he happens to be the director of the CBI which happens to be the perfect position to keep an eye on Jane and make sure he doesn't get too close and to try to keep him under control. Oh, and did you see the boxes full of false identities, passports, money, and other equipment he has in that storage room?! I should think that is a pretty big sign that he is up to no good... And the way he killed that bartender without any look of regret or emotion on his face. He is a ruthless killer who will stop at nothing to get what he wants.

Well, I hope that my ramblings have enlightened you and hopefully you have learnt something from this. I may not have changed your mind but I hope that some of what I have said will be considered and perhaps taken seriously.

Thanks for reading,

The Heir of Black

There are only say...2-3 suspects I feel. 
Kirkland - Dead 
Stiles - Dying/Dead (and he's too old to fit any description anyway)
Bertram? - Way too obvious if it was him. It wouldn't fit the Red John legacy anyway. Besides, Red John isn't even supposed to have been revealed until next episode.
Reede Smith - He's in jail. I agree with Jane when he said Red John wouldn't open up like that. If he was RJ, he was almost killed by Tiger Tiger several times, and RJ wouldn't let that happen.

Partrige? In the beginning I thought he was 100% dead. Then I read some theories and thought maybe... But no. Cho saw the body, Heller said he was dead, and it just seems all too unlikely. It would be a fantastic plot twist, but eh. Very doubtful.

Leaving us with 2:
McAllister
Haffner

I don't think there is any other way it is not either one of these two. I choose Haffner, but its up to you guys :)

I know, I know. Another Partridge theory. But I wouldn't waste my time writing this unless I felt I had something new to posit.

Bertrum: Unlikely for a score of reasons. While under the threat of torture a few episodes back, Jane refused to divulge his list of suspects to Kirkland. In what type of fevered dream could someone think Jane would divulge the identity of Red John to the media (the world), as was implied last week? Make no mistake: Jane wants Red John for himself. So it makes sense that he would give the media and the police a name he was certain was not that of Red John. And that's not to mention Bertrum's attempt on Jane's life in the hospital, and the way he sloppily murdered the bartender. Bertrum is a bad man -- a killer. But not our highly skilled serial killer.

Kirkland: Kirkland seems unlikely, as well, and so does his twin brother, or his clone, or any other device one could use to make this square peg fit a round hole. Unlike some of the characters I will touch on shortly, Kirkland's death is indisputable (we saw him shot repeatedly in the back). I admit, we can't be sure which Kirkland it was that died. We have to assume it was Bob, but perhaps Michael had been posing as Bob. We can't be certain. But one Kirkland is dead, and it seems bringing the other into the picture would be tedious and contrived. I don't think the writers will introduce twin Michael (Who just happens to walk, talk, dress, and look precisely like Bob!) as our man. That would be too soap opera-esque. It's difficult to pinpoint a way in which the writers could tie either of the Kirklands back into the story; we don't have enough information. 

Smith: Nope. Just nope.

Stiles and Hafner: This is where I'm going to do a bit of guess work. Of the three presumed dead after the explosion at Jane's house, I trust McAllister was the only one to survive. It's been covered here ad nauseam, but it doesn't make sense for McAllister to be dead considering he was pulled aside with Bertrum and Smith, who came away unharmed. McAllister is alive and the promo seems to corroborate that. Now, it is my expectation that Stiles and Hafner are dead -- dead dead. We can assume Jane was standing in the middle of the room with his gun as the bomb went off (Stiles and Hafner were still seated and the three with the "Tyger Tyger" tattoo were positioned along the opposite wall. Jane's injuries were significant enough to land him in the hospital, but not for long. I doubt Stiles and Hafner were so fortunate. Most theories predict the bomb was placed by one of the suspects, meaning Stiles and Hafner would have taken the brunt of the explosion. If Jane was hospitalized with his injuries, Stiles and Hafner would likely have required care as well. I suspect the two are dead, or somehow managed to leave undetected with serious injuries -- injuries that would not have healed for Sunday's reveal. A bit of guess work there. Maybe I'm a bit slanted -- the thought of Jane strangling a 70-year-old and possibly injured Malcolm McDowell makes me cringe.

McAllister and Partridge: I group these two together because I believe they are both living (despite being presumed dead), and are the only realistic and redeeming suspects remaining from Jane's list. It can be assumed McAllister is alive through the promos and his location at the time of the explosion, but many are still skeptical as to Partridge's status. To those skeptics I ask this: Have I made any massive leaps or reached any unwarranted conclusions to this point? I might have taken a few wrong steps, but I think most of what I have theorized is logically based (you may disagree and please comment if you do). If what I have written holds true, then Partridge is almost certainly alive. This theory hasn't required a ton of guess work or time to conceive (it's taken me longer to type out than it did to think through), but I feel confident in dismissing the five suspects I mentioned above. If Red John is not one of those five, but still one of Jane's original seven, then he is either McAllister or Partridge. If Partridge is truly dead, I'm confident McAllister is Red John. But I give the writers a little more credit than that. I don't think they would enter Sunday with one realistic suspect (at least in my mind). That is why Partridge (aside from Cho not verifying his face, and Jane acting suspiciously after seeing the photo of his shoulder) must be alive. He has to be. Otherwise, I can say with a considerable level of confidence that McAllister is Red John, despite having only seen the 20-second promo.

If I'm correct and it comes down to McAllister and Partridge, I think the Fangoria-reading ghoul is our guy. McAllister is alive, but what are the chances CBS would spill the beans by picturing Red John in the promo? Please. McAllister will be in the episode in some capacity. The writers may even try to convince us (briefly) that he is Red John, though I doubt he is. Partridge fits the mold and a number of posts describe why in great detail. But whether Red John is Partridge or someone else, I have a strange feeling Jane has known for a while, and that he's been working through a plan that, once revealed, will fill a lot of plot holes from this season and throughout the series.

I'm not certain, but as a wise man once said, "I figured the odds were 70-30 I was right. I wouldn't call that terrible. A betting man would call that risky, but certainly not terrible."