Saw online an interesting theory...someone suggested that Jane's brother in law, Danny, is Red John.  After listening to their voices, they sound very similar.  Do I find this likely?  Not really.  Possible?  Yes.  After seeing season 5 episode 5, I don't think it is Danny.  We clearly see the FBI agent who is working with Red John, then we see a man in the car, assumed to BE Red John.  We don't know this for a fact, but his voice was also similar. We only heard him speak two words though.  What do you all think?