Just wanted to note something about the end scene in S6 episode 1 where Lisbon is in the house with Partridge/RJ. People keep mentioning in their theories about Partridge being alive that Lisbon was grabbed from behind, that no one else was seen behind her that we could see from our angle, and/or that she was standing so close to Partridge's body that it had to be him.
BUT! We know that Lisbon was tasered by RJ, that is his usual method. So it could be that her fall just happened to look like she was pulled from below (not on purpose). When you're tasered, you are immediately stunned and you fall in any direction. Additionally, you can be tasered from quite a length (I'm pretty sure).
Also, further proof that her fall was likely in a random direction due to taser and not meant to reveal that it was Partridge pulling her is that if it was Partridge, and she was tasered after she was grabbed, then she would have known it was Partridge. Even if she didn't physically see it was him because it happened so fast, she would of felt him pull on her ankle/leg and known it was him.
I'm not totally against the idea of it being Partridge but this is something to consider for sure.