Just someone to think about is Tallman Bunting. Season 2 episode 21. Jane placed chess with him mentally. He has very high connections because he go off with all the charges, he's very wealthy. He is also like Jane in that he is very good with puzzles.

Red John is one of the visualize. He is a man (for sure), and he was in Alison farm, I think he started before the age of 30.

CBI agent Ray who is trying to get Agent Lisbon to join him in independant consulting.

I think Jane already knows who Red John is but does not have enough proof yet and does not want to scare him away and that everything to have happened up to now was just acting to get closer to him.  I think the scene where Van Pelt opens up to Stiles was staged and is just meant to tempt Red John to approach her. 

I think that maybe Red John is not a member of Visualize, but he wants Jane to believe he is (maybe he even wants to mislead Jane into going after Bret Stiles specifically, either because he would obviously make such a good suspect, or maybe because Red John has some personal issues with Stiles and Visualize that he cannot solve by simply killing them).

I think that we just don't know why yet. Maybe Visualize (or Stiles) has taken some relative of Red John long ago, maybe Red John believes that Visualize is the only organization with enough power to compete with him and he wants to use Jane and the CBI to take them down, maybe he even has strong religious beliefs and wants to destroy Visualize for religious reasons. Or maybe Bret Stiles knows too much about him and has become a threat, some kind of threat that would be too dangerous to simply kill (imagine if Stiles has left a note somewhere in a safe to be opened after his death, revealing the identity of Red John...)

I think maybe is FBI Agent Kirkland (Kevin Corrigan). He shakes hands with Jane, I don't remember in what episode, I think in season 5. Maybe in the flashback when Jane first arrives at CBI.

Ray from last nights episode