I would say fairly that the season finaly removes Bob Kirkland from the list.
Presumably, Red John would have know who Jane's 7 suspects were while Laureli Martin was still alive, therefore, if Kirkland was Red John, then he wouldn't have needed to break in to Jane's room and steal the information, as he would have already figured it out at that point.
One other point however: The reveal at the end of the episode you see the video playing and Jane dropping the photos. You don't actually know that those are the same 7 as on Jane's list. Maybe only a few of the names Red John listed cross over, therefore shortening the list.
I'm going with Bret Stiles for a number of reasons:
I feel that the wording in the video is very suggestive of his speach style. He has the means and the ability to control people and 'brain wash' them. They way the RJ followers we have seen act, they all act like the mindless cult people as well.
Guess we will see one day!
