John (!) Musashi- lawyer of visualize. I know he is not on the list but Bertram just doesn't fit as the crafty and manipulatory Red John to me. In the episode 'his thoughts were red thoughts' ep. 16 season 4, Musashi comes into the interrogation room were Bret Stiles reacts quite weird. He shrugs and crunches like he is afraid of his lawyer and than is apologetic about the situation. It looks like the lawyer is in charge not Stiles. Also visualize should be somehow connected to Red John.