Look up TheMentalist301 - Never put your hands on Jane! on youtube. When bertram greets patrick, he calls him "our boy of wonders" which is exactly what patricks father called him in the flashbacks of episode 2x10... Coincident? I'm not saying that he is red john, but it is rather strange.
I suspect that Robert Kirkland is red john because when he bumps in pj and patrick asks if he knows Kirkland he replies "no but I know you" he also shakes hands with patrick and at the end of the episode where we see patrick Jane's first case when the woman in the limo ( don't know her name) says that patrick used to be in an insane asylum she looks in to the front of the car and says it's done there sits Kirkland and he says "good"
From the last episode I think RJ is Kirkland cause he's on the inside and his soft baby voice kind of matches RJ's from the episode where he quotes Tiger Tiger and he touch him before he walked away
People i think i might found another clue...
Beside the fact that RJ is most likely a Caucasian male, ~6 feet tall and short hair. There is the 4x13 episode when Rosalind is telling to PJ by phone, that "Roy Tagliaferro" is there with her and you can clearly see RJ's LEFT hand, holding a cup of tea!
On his fingers, there's no marriage ring so "He is Ma..." definitely doesn't mean "he is married". Plus (my opinion), the graciousness of his hand, holding the tea cup, might also suggest that he is English! (and also the "Tyger Tyger" quote).
About Kirkland... i was thinking thees days at another theory: What if Kirkland, like Lorelei, was once an RJ follower and now it's trying to chase him from the "inside"? That could be a reason for the concerns about his cover(?). Please don't send me to hell for this...it is just a thought :)
the real red john is ellis mars. he is a psychic, so he can hipnotize people to do what he wants. and also he is someone almost no one would consider to be rj, in fact, his appearance is only in one episode, and if you see jared Renfrews writing on the wall, you can organize the words as:
he is ma
ehis mars
the double L¨s were badly writen and the look like H.
I think Wayne Rigsby is the real Red Jhon :) my theory is RJ love stuff that related with RED, e.g Blood, Red Hair ! as we all know Wayne like Grace VP (red hair), and also at season 5 episode 16 , lorelei said, RJ actually someone that Patrick Jane already knows, and she said, Jane should make friends with Jane, but we all know, that wayne friends are Kimball Cho, but not with patrick Jane! even wayne is not to smart on CBI, I think wayne only pretend so patrick can recognize RJ,
if my prediction right wayne is the real RJ! to be Honest ,I am not surprise :D lol
I have always suspected Van Pelt since the start. My theories may be flimsy but just a few things I believe, Red hair for a start. In the pilot Van Pelt is introduced to Jane and shakes his hand, she also has a go at him around the dinner table showing a complete hate for him. Shooting her fiance is also intriguing, was he doing it for her? When pregnant in real life amanda righetti was kept in the show when other programmes would have written her out until she was ready to come back, I know she has now finally been written out with the story of her going on a course but it just seems weird? Like I say I've put this on as a little guess for fun but I have always suspected her. I wonder if I will be true. Is red john definately going to be revealed in season 5? I am a viewer in the uk so may be a bit behind you in america.