Bret Stiles is the only Logical person who can be Red John.

1- He convinces people spiritually to die for him
2- He may actually be a bad Psychic.
3- He has been accused for murder in his past.
4- Old enough to do the old crimes suspected to be made by RJ.
5- Partridge can only be a puppet of Stiles.

I actually think RED John Is a puppet of Stiles
I think RJ is seperated into two.

1-The Brains (Stiles)
2- He sends people to make his crimes..
3- The crimes that are signed by RJ and a bloody face is Bret Stiles himself.