Well, I have many days reading some impressive theories here; it has been my hobby this week. This is maybe my favorite show because has catched my attention, at the point of having me here putting a theory
First thing I want to say is that we have the believe whats Heller has said on interviews like "we can trust the list" and "I decided who was RJ many times ago" and "Brett Partridge is dead" simply because he can't go out saying lies on interviews and expect that people can trust him later. Many people who write stories think in the final first before even start. What I can say is that all the things that Bruno says on the interviews are ambiguities... Now that you know my opinion, here there are theories...
1- Partridge could be alive. He can be the one who has two personalities Brett Partridge and Red John. He killed his Brett Partridge side when Jane discovered the seven suspects. RJ has followed Jane steps since Patrick said he will catch him; being also a mentalist RJ could easy figure out the 7 suspects. Including himself Partridge. He could fake his death immediately to avoid Patrick suspect of him.
2- Another theory is that BP is actually dead and that Tyger tyger organization has nothing to do with Red John and he just wanted to keep Jane busy; thats why maybe he told to Partridge about the cops and Tyger Tyger stuff before kill him. Just to mislead Jane and the team.
3- If Partridge is actually dead; Ray Haffner is Red John because fits with all the descriptions and Stiles covers him. But also can be a trick from Heller, not because he fits means he is.
4- Another crazy thing that is in my mind is that Red John manipulated Jane by planting all the clues to confuse Patrick. RJ is smart enough to do that. Threes of the suspects have phobias, two of them are members of Visualize, three of them are members of Tyger Tyger, all of them fit in some point with Rosaline description, some of them have a strange voice.... you got my the point.
Sorry my english, not my first language.