Watch any episode where P.J. looks over an edge, he's skiddish. When he is threatened with physical pain, he's a coward. Tiger Tiger poem is about burning tiger poachers' furs so they don't go on black market. (Destroy the thing you love most to save the ones that remain.) Think this correlates some how to P.J. killing own wife and kid.
Also P.J. has ties with Brett Styles. Who  could have been the person to hypnotize P.J. into becoming "patrick jane" (pink/light feminine) instead of 'red john' (red/dark masculine). And PJ would have needed someone with that skill to hypnotize him. Maybe that's why he went to a job field similar to a detective, so he could find his clues and piece them together? 
Bob kirkland reveals Homeland/fbi have been looking into PJ being red john for 8-9 yrs show is only 6th season. Why would they look into PJ prior to wife and child's murder. (Roughly 7-8 yrs ago in their timeline.) I also thought weird how in the episode RJ saved jane, and first said Tiger Tiger lines, it voice decoded as jane's. And now we see Tiger Tiger is a code word for some kind of occult. Maybe that was a member giving a message to another member. I think Jane planned things out prior to the murder. If it was a murder? (Hightower died and returned within 1 episode.)
He fits the description of red john, both physical, and now presence (His ex therapist's dictation recorder)
I don't think it can ALL be coincidence. But I'm probably wrong. Kudos to the writers!! 

So, Patrick Jane is Red John. He took on the persona in order to see who was tracking him down, what information they had, and disperse them from the side "red john" can't. Tiger Tiger- Destroy the things he's come to love "lisbon" in order to save the rest "wife and child" who aren't dead????!!