Hi guys, i will try to look in the small details, cause for me if we look in the bigger picture, it's possible to accuse any of the suspects, Bruno Heller is playing with us, not a very nice guy if you ask me.

 I'd like you to keep some things about Red John in mind while reading this.

1. He admires Jane, he thinks of Jane as a 'friend' and even loves Jane in a certain way (Brett Styles says that, and he kept and saved Jane's life until now for a reason).
2. He's bold, not afraid of being caught, he knows how damn good he's, so I don't think Red John wouldn't do extreme changes in his personality just to keep the police off his tracks.
3. He loves women, in his own psycho and disturbed mind, but he do.

Ok, now with the suspects, i will stay with the 7 suspects, cause I don't want to go mad thinking about all the others.

Partridge: Dead. Period.
.. Okay, even if he wasn't, if you think about the 2 point I listed above, Partridge plays dumb, don't think that a narcissist would play a dumb character just to avoid suspicion. And yet, Partridge hates Jane.

Bertram: like this one, and till the S06E02 he was my favorite, but some things happened.
Assuming from season 3 finale that he's connected to RJ, or is RJ himself (a lot of theories about this on this site, not going in details, sorry). Now in the reunion with Reede Smith and Mcallister, Reede Smith was literally pushing Bertram, giving him orders and saying what he's suppose to do. If Bertram is RJ, it would not happen, not with Reede Smith leaving the room alive.
Oh, and Rigsby thinks he's RJ, Rigsby is always wrong.

Brett Styles: hard to eliminate too, but in one of his conversations with Jane, he talks about RJ as someone bellow him "Oh, I know things that you and your friend Red John would never imagine" or something like that, I don't think he would put his alter ego in a position like that, it's like Bruce Wayne badmouthing Batman, and again, he's a narcissist, a narcissist never talks this way about himself.

Haffner: don't remember the episode, but when he assumes the team, Van Pelt tries to talk to him about some development in the case, he ignores her, not even a glance at the beautiful Van Pelt, RJ is obsessed with women, it goes against his nature to ignore beautiful women.
   Oh and about the Lisbon not being dead that some people are arguing that RJ didn't kill her because he likes her.. I don't think so, Red John asks Jane to kill Lisbon. Ok, he knew that Jane wouldn't do that, but only the asking part is good enough to assume that RJ doesn't care that much about her.
   Now, if you ask me why RJ didn't kill Lisbon, I think that is because he knows that if he killed her, Jane would have another break down and spoiled all the fun he has 'playing' with Jane.
  Another aspect about RJ here, he likes to play his mental games with Jane, and I know all of you already noticed this. With Lisbon dead he would miss this. So I think RJ is leaving Lisbon for his grand finale.

 Bob Kirkland: Don't have much to say about him, except that he does things in a way too.. rusty i guess, hiring people to break Jane office, killing the guy in the hospital with a pillow, seems too much no-red john to me.

Reede Smith: again, not much, he indeed gives orders to Bertram, but he seems a little bit uncomfortable (body language) in the meeting in this episode. And he's too fat, but I'm trying to stay out of physical characteristcs here.

McAllister: In contrast with Haffner, do you remember what was his reaction when he was alone with Van Pelt? Creepy, a lot creepy. In the meeting scene of the last episode, he was the one with the more relaxed body language, like "I own this place", he didn't talk much too, and very often the person who talks less in this type of situation is the one with more value between the presents.
He asks Jane to call him Tom too.

Oh, and Sophie says that RJ doesn't like adversities, but we know that RJ likes to play his mental games, so I assume that RJ only likes to play when he knows that he's going to win. Remember the reaction when he loses the rock, paper or scissors? Silly, I know, but its worthy to mention, it's the only time we saw him angry.
The interrogation scene in S01E02 where McAllister gives a look to the person and she starts talking is a bit strange too.

And that's it. I'm probably wrong, but that's just some notes I made that I'd like to share with you. Sorry for any mistakes, english is not my native language.

Lisbon says in 6x02: "Turns out RJ is not that tough. He barely laid a hand on me".

Not too clever a thing to say to someone who is suspected to be a serial killer with ego problems, is it? :)

Wow, watch 6x02 again and listen to what Bertram says to PJ at about 09:40: "if you have RJ in your sights, I will be there". He did not say "I want you to tell me" or "let me know immediately", he said "I will be there". Like he was RJ himself, hiding right before PJ eyes, telling him he will be there once PJ has finally discovered that RJ is him.

The fact that McAllister appeared so briefly as a seemingly insignificant one-shot character in the series' second episode, and is now suddenly an important figure at the forefront of the Red John investigation is a pretty solid indicator that he is likely Red John.

His strangely aggressive behavior with Grace Van Pelt outside the winery, during that second episode (Red Hair and Silver Tape) is never explained, and even though I've always found that scene suspicious, I was inclined to dismiss it as a plot device to give Lisbon a plausible reason to leave the motel room she and Jane are staking out. Jane is then forced to confront the husband and wife killing team alone, which makes for a better climax when Lisbon then kicks the door in and is forced to kill them both. I'm beginning to think that my initial gut reaction to that bizarre behavior McAllister exhibited was bang on, and I should have listened to my intuition from the get go. If Sherriff Thomas McAllister isn't Red John, they're definitely buddies.