http://insidetv.ew.com/2013/05/06/mentalist-finale-season-6-red-john-list/This is a link to an interview of Bruno Heller about the list of the 7 possible  RJ. It helps to already rule out PJ as RJ and the possible idea that the list is not reliable :)

Personally however I think Bob Kirkland is either RJ or his accomplice. If you guys remember from the episode of PJ's first day at FBI, it ends with the FBI attorney (the mean red head) asking Bertram for information on RJ on the phone. Then she says "it's done" to a Kirkland who was in the same car as her. Maybe it is her ... who knows... since apparently being a red head makes you Red John (Van Pelt reference)