First of all I want to say that i don't think that RJ is a psychic. Some of you could believe this because he knew the 7 suspects on the list and because he killed PJ happy memory.
I think that Lorelei isn't death or for sure isn't the death woman we think it's Lorelei. Maybe RJ killed her but nobody found her. So it's a possibility that RJ made the video after Kirkland broke into Jane's investigation room. I also think that PJ told his Happy Memory (Eileen Barlow) to a doctor during the 6 moths he disappeared before working for the CBI, and this doctor told it to RJ. For these two reasons I don't think he is a real psychic, but he is a good showmen, just like Jane.
Now let's eliminate some suspects

Bob Kirkland
He could be RJ but Rj usually don't do crimes like killing Jason Lennon himself,so it's pretty obvious he is one of Red Johns powerful friends.

Reed Smith
He don't matches with Roslind's physical description

Bret Stiles
He could be RJ because he is a mentalist,but he is too busy to be RJ and why would he tell the location of Krystina Frye if he is RJ. It's way too dangerous! (Krystina could remember something about him and tell it to PJ. But he knows Red John.

Brett Partridge
He hasn't the intelligence of a serial killer

For me the only three suspects who could be RJ are Gale Bertram, Tomas McAllister and Ray Haffner.