First of all, I need to ventilate a bit. Is it just me who got really pissed off with the fact they left the caretaker woman in a police car with one random officer, knowing every single rj accomplice so far killed him-/herself? No, that's straight out f**king stupid and is either a bad move by the directors or Jane is hiding something about that video. My money on the first assumption.

However, with the list and this latest Heller interview we must assume this list of 7 contains the one true culprit. My guess would be Ray Haffner. Why?

Well for starters 

1) He's got the fitting appereance as described by a few, especially Rosalind in regards to his haircut. I have not paid much attention to any rings on his fingers, but someone might be able to add to that.
2) He's the right age and flipped off Teresa in the conversation of Vizualise and him being the appropriate age for the timeline of the farm murders.
3) He's shaken hands with Jane.
4) He's in a position of power and money, the latter strengthened by the fact he offered Lisbon a job that'd increase her paycheck significantly. He does indeed try to get closer to Lisbon, however, I don't see this is a real clue, but it might be.
5) This is a pretty far-fetched theory, but remember Bertram reciting the 'tyger tyger' poem by William Blake to Lisbon and LaRoche I think it was? When asked where it came from he said he heard it from a friend, I'm pretty sure he's friends with Haffner. Far-fetched, but maybe ;)

However, there's a few things pointing against him, such as the fact he doesn't seem that manipulative nor psychic - his voice doesn't match it either, but yeah, could be altered.

Brett Partridge is also a seemingly acknowledgeable suspect, even if he's a very 'obvious' red herring. What is it with people saying he's young and can't fit the age description? Noone's ever defined his age, and in real life t he actor's born 1968 which would mean he'd be around 45 years old today. That could fit, no? Not gonna go into why he's a probable suspect, that's already been posted a lot on these boards.

Another red herring is Robert Kirkland. I don't think he's RJ simply because it'd be too obvious, he also entered the show too late (apart from the car scene) and I have a feeling he also wants red john, maybe for the same reasons as Jane does. 

Finally, I think the Tyger Tyger poem as so often recited by Red John and others bares some kind of clue to the culprit. As far as I know the poem is a sister poem to another poem by Blake called The Lamb, where as the Tyger is a duality between beauty and animalistic tendencies in human beings. Could this be Vizualise talk? 

Sorry about potential bad english, not my native language.