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?