Alot of the clues are obviously pointing to Brett Partridge and for this reason I would rule him out. Its the mentalist and like the show name the hunt for red john is the same - one that plays with your mind. I think that Red John is not a group of people as it has already been demonstrated that there is a 'cult / following' attached to what he does i.e loreli, craig so for it to turn out to be a group would be daft. I have no definite suspect in mind but i suspect that it is or should be someone that the whole CBI team know and will be the ultimate betrayal to each and every one of them in some way or another.. RJ will have had it planned all along that Jane would join the CBI so when the truth about who he is comes out the whole team will fall apart... literally. Also, I believe to go full circle it has to be someone who was in the first season, someone we probably didn't notice at the time and may have been in many of the episodes obliviously in the background (if any of you watched fringe, like the observers)
