I still think it's Partridge!
Earlier in the episode, Jane says, "If he is Red John, he is a very good actor". And Lisbon says, "Well you would have to be". With this is mind, I think that Partridge is just acting dead in the creepy house. With Lisbon unconscious, there is nothing to stop him from waking up and clearing off. Of course he has to have an accomplice but Red John has had accomplices in the past while killing.
If it does turn out in next week's episode that Partridge IS dead and the coroner takes away his body, well then maybe the coroner is one of Red John's accomplices too and declares him dead while he is just sleeping or unconscious due to some clever drug he has taken. I bet the body gets put in the morgue and then he gets woken up by a disciple at the morgue, and then he goes on killing, all the while everyone thinking that he is dead.
I like Partridge for it! All the others don't seem to fit in my opinion. Loreli Martins was a lover of Red John's. I can't imagine her going out with any of the other suspects as she is pretty and they are all a bi