In a Orkut community, post date 05/11/2011, I wrote that I wouldn't still bet on Dr. Linus Wagner ( eps 1x01 "Pilot " and 3x08 " Ball of Fire ). Justifications:
1 - He has appeared twice in the series, like says B. Heller;
2 - It's stuck, so far from suspicion, but he could still communicate and to transmit orders due to their privileges as detainee;
3 - His fanatical followers would mostly former patients or members of stray Visualize Self-Realization Center, i. e., potentially anyone. Examples: O'Laughlin, Rebecca, Brett (forensic expert), Minelli, Bertram, Mashburn and all other usual suspects.
4 - Maybe some past disagreement between Dr. Wagner and Brett Stiles has generated a split in the sect, and the fanaticism of certain members weighed in choosing whom to follow. Brett Stiles (same name as the expert, just coincidence?) left in the air that he knew "a lot more than Patrick and Red John ", then it is possible that he is the one who chose to remain on the pacific side of the activity and RJ, by otherside, would be distorted, eager to shape the world through their will, using useful idiots to form social connections and act violently.
5 - Scenarios inspired by a mix of Psi, Masonry x Scientology, Legal and Police Bureaucracy;

Anyway, it is clear that Bruno Heller, to create a series that addresses issues with hypnosis, PNL, religion, "mind powers", persuasion, influence, etc. are trying to show all possible points of view of the subject, from academic to the pseudo-religious fanaticism. As some have said , the villain of the story is just a backdrop for everything that can be explored and known, making even those who do not like the subject remains watching the series due to its mysteries and curiosities.