For the record, my brother thinks Red John is Patrick Jane, and it did seem plausible, until I read some of the the other "theorists" feedback. Originally, I thought Red John was the red headed spiritual advisor, but I now move my theory to Grace van Pelt. She acts too innocent- and as Johnn Depp would say - "Evil wears many masks, but none so dangerous as the mask of virtue." She's always around, so sweet, has red hair, and she knows where Patrick Jane is on the Red John investigation. She would have the "last laugh", if it's not Patrick Jane. I have nothing to base it on, really, except gut. I haven't rewatched any of the episodes. But, I welcome feedback and if anyone can prove / disprove my theory let me know.