i believe all these ideas of RJ being a group of people as false. As we know, Rosalind identify's red john as a short man with specific characteristics, also when he speaks to Jane at the end of season 2, he seems to fit all the characteristics, short, soft, high pitched voice (confirmed in red john's footsteps) at first i accused it would be Kirkland, or Brett partridge , as Kirkland requested updates on Jane when he first joined the CBI, at the end of red dawn. When he first shakes hands with Jane, he has a devious look about him, especially when he says Jane doesn't know him, but he knows Jane. But i realized it was very unlikely to be Partridge, or Kirkland.  reason being is that partridge seems to tall according to description, also in the episode where bosco's assistant is arrested, you can assume it was red john who poisoned her in the flesh judging by the look on her face, but wouldn't they realize if a forensic investigator was walking around in a police suit?  i don't think it was Kirkland because him and Jane hadn't shaken hands until after Lorelei told Jane about it, however, i still don't know why he wanted updates on Jane, and why he hasn't appeared anywhere else in any season. i believe Darcy is an accomplice for RJ because he tells Jane that he has someone in the FBI who told him, but i believe nobody knew except her and her team. Also, she shoots at the car, probably because she knew RJ wasn't in there, she was recorded by Red John and he said 'she's cute, this will be fun' yet RJ didn't do anything to her, and she didn't seem upset by it whatsoever. BUT, i do however have have a theory on red john, he doesn't think of what he does as a 'bad thing' or 'cruel', he see's it as art, or passion, i say this because he kills anyone who pretends to know him. slandered on the media by Jane, he kills his family. gets insulted by James Panser, gets killed. Called a Beast by TV talkshow host, kills her, the list goes on. i don't know who red john is, if i made an educated guess, it would be Brett Partridge, even though i think he's a bit to tall, i can't recall his exact size, his voice fits the bill, and he seems like a big fan of red johns work in the first episode ( even though it wasn't red john) thank you for reading, please respond! :)

I don't know who Red John is, but I am absolutely sure isn't Ellis Mars and Walter Mashburn, because Red John never brings himself at ridiculous position like they.

My opinion Red John is one of them: Brett Partridge, Oscar Ardiles, Ray Haffner.

I just saw an episode in which 3 men were murdered at a farm in Ellison. On the farm wall the Red John token has been drawn and has been there since the mid 80's. Ray Haffner is a member of the Visualize cult, and the farm used to be owned by the Visualize cult. It is said that some young member of Visualize painted that token when he worked at that farm. Ray Haffner was 21 at that time. He offers Lisbon a new job in his new firm, trying to split up Jane and Lisbon. I really think he did it!!!!