This theory has 2 questions for you.

Question 1 to those who think Kirkland also hunts Red John:

There is a missing piece in the theory that Kirkland is also hunting RJ.

If Kirkland is hunting RJ as well, and talked to Lennon to know whether his cover was blown or not, why would he keep everything from Patrick?

Who is a better friend than Patrick Jane to hunt Red John? He has a hell of experience, he is smart.

Kirkland didn't talk to Lennon at hospital about Red John at all. In this case, your theory assumes that Kirkland knows RJ already. Why else would he not ask who RJ is?

If he is after RJ and knows his identity, what is all these episodes about? Why doesnt Kirkland kill RJ already? Only explanation would be that you can hardly reach RJ, because he is imba protected like a president or something. This won't make sense for the series.

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Question 2

Where the hell is Bret Stiles? He is missing since the murders in barn were found out. Remember the episode. The sheriff or whatever finds the bodies in barn, and learning that those murders are associated with the activities of Visualize, Patrick and Lisbon? go to Visualize. But, Bret is not there and the guy says that "Bret Stiles told me to help you in the best way", before even case is explained.

So, Bret Stiles heard about the discoveries of bodies in barn. How?
He left the town avoid questioning. Why?
And of course, what is he doing all this time?

Bret Stiles is not around for a very important and specific reason. And I think it is the key to know more about Red John. Why Patrick quit chasing it, i have no idea. In fact, Patrick's actions never make sense, since he is supposed to be smart.

http://www.allmyvideos.net/2uc6do72docz# minute 34

That's episode 8 of the 2nd season. If Minelli is Red John and Red John poisoned Rebbeca, the guys who are taking Rebbeca would have recognised him, do you think Minelli would put himself in risk of being recongnised?

Sorry guys i am just endet season 3...na P.J have kill R.J the guy its not the red john? (sorry for the bad english)

okay so.. i dont know who is red john, but i have a remark.
I think Kristina Frye is involved somehow, and she wasnt kidnapped. If red john wanted to hurt Pj, he would kill her as his wife and daughter. 
think, Rj always leave alive only his accomplices, except Pj.
I think Kristina Frye is a friend of Rj.

I don't know how RJ is...i want to tell my thought about RK...first of all i was thinking of the part where he ask the other guy do you know me and etc....well the other guy told lorelai that he choosed women for RJ...so how about this:

he picked a  woman related to RK...and RK took or viseted that woman to that celter he used to pick up women for RJ...so he have seen him again in the past and maybe he has seen RJ..but i don't think so because if he knew who he was and had seen him he would already took his revenge, but i believe RJ has seen him..so i continue..maybe that is why he asked that guy if he knew him...to see if RJ is able to recognize him in case he gets to him...and he kills him any way so that PJ don't get closer to RJ than he is...about that friend think i believe that is ironic he just wants him dead and make it look like it was of natural causes..somethink i wanted to add on this part is that...who wants a painfull death??? and why does it have to be close friend if i had a choise i just wanted to be quik and painless...even if that ment that i would be killed by satan him self..just my though..waiting for answers :)

After reading the latest theories and watching the latest episodeagain something really stuck out.

A previous poster wrote down that he thinks Kirkland is Red John and has a new face. While this doesn't mean he is Red John it was very clear that he wanted someone who had supposedly seen and met with Red John to know if he could recognise him.

Now, go back to the scene in the episode where the nurse tells Jane the federal offices are creepy and she thinks they will pull a mask off and expose their alien face? I think that is something the writers have purposely dropped in on the hope that people wouldn't pay to close attention to it.

The writers of the show always subtlety drop hints if you pay close enough attention. The big one in the latest episode was when the PR lady calls the investor and the producer walked away and answered the phone - note the rye smile on Janes face. Incredibly subtle but he knew what was going on - the charade about the jazz hands was just a way for him to divert attention.

I used to be convinced Jane was Red John but so much stuff is coming out to prove he can't be - unless these writers get really clever!

This is more a theory and pieces fo a puzzle than a guess

1) There is the phrase "He is Ma..." Usually when someone knows a person or is trying to give clue they just write or say the name. A phrase written like this is when someone is giving a description or telling something about someone. I've always thought it could be "He is masked."

2) On the last episode Episode Kirkland kills the guy in the hospital but first asks him if he recognizes him. Even with a no answer the guy is killed.

I'm not saying Kirkland is RJ. In fact I find that too obvious a guess. But that doesn't mean that part of RJ's group, etc doesn't go around with disguises. I don't think they are going Scooby Doo on people but would it be outside the realm that maybe it isn't a male but a female in disguise? That would open things up. Or if it is a male, a disguise would allow one to be close to the police and have inside info and then also do their own thing outside of that realm.

I just think there is more to "He is Ma" and that it is a description more than a person.