So...Maybe I'm just getting bored after season 6 and 7 which are quite uneventful when compared with the 5 others... Or maybe I'm just wishing for a finale that is as twisted, original and surprising as the whole show but, here's what I think, or at least the start of it: I've read Theresa90's theory, which seemed a bit far-fetched at the time, I must confess. But then, THEN, I realized a few things in yesterday's episode which actually sustain this theory... Especially the most far-fetched points!! Here are the things I noticed : 

First: The one that got killed was a 'psychic'... And we all know Jane doesn't believe in psychics and even despises them. Strangely enough, Gabriel got killed because he was a 'fake', as written on his arm... Now, isn't it strange that the guy that Jane is apparently the only one to despise should die exactly when Jane feels insecure enough to spend nights away from Lisbon?

Second: There always seem to be an event triggering the murders linked to Red John. Now, I thought a lot about what the number 3 could mean... As I'm sure you also did. Well, what if 3 referred to Jane and Lisbon + a baby? Some seem to think Lisbon is pregnant, basing themselves on a photo of the finale... That's a thin clue, but lets imagine she is... We're sure Jane would know before she even tells him, right?I will conclude those two points with a Theresa90's observation about narcissism... Don't you think that the fact that a 'psychic' would be right about the number 3 is enough of a reason for a highly clever killer struggling with narcissism to kill?

I also thought about that second personality... And I remembered the moment Jane woke up in the grass and when he told Abbott he had no idea where he was...
Anyway... That's thin, I know but, I'm really hopping for a massive surprise in the finale!