I think its Ray Haffner is RJ, Firstly Styles is to involved to bed RJ, he and Jane have a specal relationship and i'd want RJ to be a shock to the audience.  Bertram may be involved but i dont think he has the intelligence to fit the persona. Brett Partdridge again is a good dummy for the audience, hes perfect for the suspect, voice, heigh and age. i think he's a helper to RJ but no more. Ray has been involved from the beginning but we havent seen alot of him, hes part of the FBI team, one of which was an accomplice to RJ (Van pelt BF). Im sure alot that watch him ge a weird vibe off him. There's a scene where he tries to lure Lisbon onto his new project, she seems to be onto him and i think she may be the one to get him.