Im not exactly sure who Red John is, but im getting a much better picture of who he isnt. The red barn episode dates back to 1988 or a bit earlier, which means if red iohn started very young he is somehwere between 40 (at the young end) and his early 50's. I think we can safely eliminate stiles, partridge and reede smith. Similarly, I think we eliminate those three bc jane would never have been friends with partridge or smith and I believe he already considers himself a friend of stiles. That leaves bertram (who I believe is a bit old), haffner, kirkland, and the sheriff. I will be amazed if haffner, bertram and kirkland are not all connected. Kirkland is tight with the head of the fbi, hafner came to the cbi from the fbi and betram is tight with both of them. I do not think bertram is red john, I cant imagine a connection to visualize, I do not think jane would ever befriend him, and I dont think he could be head of the cbi and be red john. I also have to take into account the lorelie factor. The poker episode also leads me to believe he is not red iohn, but I do believe he is affiliated and is helping red john. I am not sure if kirkland is also helping red john or if he is being manipulated by bertram. My impression is that kirkland knows jane from the past, perhaps was even friends with his family and now looks different. That leaves the sheriff and haffner. Haffner is either red john or the third part of the triangle of disciples within law enforcement. The epidsode we see mcallister in he acts like a complete simpleton, especially when jane beats him at rock, paper scissors every time, so either he is acting dumb intentionally or there is no way he is red john. I would rule him out based on the fact that I cant see a tie to visualize, I think he is too dumb, and I dont think red john would hold a full time position of podunk sheriff. I personally think that jane has one or two other names that he suspects but told lorelie those 7 to tell red john. Red john would then use that info to look clever, but in fact he was betrayed by lorelei bc he killed her sister and now believes he has jane's supposed list. Somehow I tend to think this whole thing hinges on whether we believe shultz and kirkland are good guys or bad guys. Shultz and kirkland clearly know about jane's pyschiatric issues and it either seems as though kirkland is asking a fvor of her to protect red john or so that he can be the one to catch him. I tend to think kirkland is a good guy, that he is being played by bertram, and that shultz is in the dark and believes what she has been told about Jane and asked a favor by someone in homeland. So my theory is:

Red john is not in the 7, however, bertram and haffner are both linked to him directly which explains his fbi and cbi connections, and that is how they got wainright into that limo at red johns request. I believe the sheriff and partridge have nothing to do with RJ. I think stiles knows exactly who RJ is and genuinely worries about jane but also doesnt want jane to find him bc of the implications on visualize. Reede smith is a pawn of RJ. I believe the story will shake out that someone who is very connected to the highest powers in the fbi will be rj as we have already seen a lot of rj connecti ok ns to fbi personnel and their adamance in taking lorelie

I think its me,yep.think about it,you never see me in any episodes,you have no idea who I am,you have no idea what Im doing while all these crimes are happening.
yep,its gotta be me.

please B.heller  say that jane is not red John how the fuuuuuck 144 theories say that jane is red john and the number get more more every 
and clues of red john say that he is a man how the fuuuuuck say that red john is lisbon or kirsitina or van pilt or rosalind 
what is the fuuuckin name of stuff u smoke 
what is the fuuuck in your head , i don't know what is that ? , but i am it is not normal brain 
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فعلا على رأى اللمبي شايل مخه وحاطط بداله طلب كبده بالسلطة

I don't exactly have a theory, although I am trying to piece together all the clues that we have been given. I have my suspicions but they are too weak to put into theories. Anyway the main point of this is to get across that Bruno Heller has confirmed that Jane is not Red John, I am of course well aware that he could just be saying that to throw us off track but I just don't think that is likely. So it has been confirmed that Jane is not the illusive Red John so I think that option if off the table!

This theory is very very unlikely, but aren't we looking for a man who is good at psychology, drinking tea, connected with CBI and may be named Roy?
Check this character:
http://thementalist.wikia.com/wiki/Roy_Carmen
Please, share any proving or disproving evidence on Carmen.

I think Red John is not a human. Yeah thats right not a human. Remember "he is mar"? I personally believe that Red John is an alien and the "he is mar" things was actually he is martian!!! He just couldn't complete it because he was dying. That's why no one wants to reveal RJ they DON'T ACTUALLY KNOW WHO HE IS! They were brain washed by RJ. So there you go that's my theory, I know that it is hard to believe but well its a theory.

Van Pelt - Involved. There's a reason she has red hair; it's not coincidence.
Bret Stiles - Involved. It's unclear the exact role of Visualize, but there is one. It was revealed that "Red John" or atleast part of the "Red John" identity worked on a Visualize farm. Since Bret founded the organization, he wouldn't fit this mold. He wasn't the kid on the farm. But is Red John one person?
Kristina Frye- Involved. She willingly went with Red John. She will most likely reappear in the final season. Has her insight persuaded Red John in some way? I think it's more than coincidence she has red hair also.
Bob Kirkland- Involved. Before he injects the poison into IV he says that he hopes somebody would ease him of his suffering if he were in that position. This idea of suffering seems to be indoctrinated. Red John is a coward, I don't believe he fully subscribes to his ideaology. Kirkland might be part of the Red John collective, but he is not THE Red John.
Blind Girl- I just read a theory about when Jane scammed the blind girl with the stone. The person didn't make the connection that RJ visited a blind girl.
It's late and I'm sleepy and a bit lazy, so let me get to the gist.
A scene that always stuck out is when Jane kills who he believes is RJ. That man knew details about his family only the killer would know. I doubt someone would be debriefed to remember that minute of details. Maybe the killings are ceremonies in which many people partake.
I believe all seven names on the list are associated with Red John. RJ was able to realize how far Jane could deduce with Kirkland's research (or maybe Kirkland for/as RJ, but that's not important). The concept of suffering is paramount to Red John. That's how he rationalizes what he does. Suffering heals. It has to do with balance read the poem RJ recited http://www.eecs.harvard.edu/~keith/poems/tyger.html
Hopefully this sparked ideas.
This is a good profile of Red John btw: http://thementalist.wikia.com/wiki/Red_John