Bruno Heller once mentioned that we will be kinda dissapointed when we find out who RJ is.So that leaves us 4 suspects.The 2 obvious and the 2 outsiders in a way that they appeared in only 1 episode.I am talking about Brett Partridge and Bob Kirkland from the obvious and Sherrif Thomas McCallister and Reede Smith from the outsiders.One of these 4 people i believe is Red John.I will rule out Bob Kirkland.I dont think he is RJ but I think he is an accomplice of RJ probably the friend that RJ mentioned in s04e24 inside the FBI.And thats why he killed Jason Lennon.It was orders from RJ because he was afraid PJ will break down Lennon and eventually he will reveal the identity of Red John.I will also rule out Reede Smith.I dont think that Heller put him randomly in the list of 7.He will play an important role on finding who RJ is.Maybe RJ himself will kill him just to prove PJ something.We will see in the next season.
So that leaves us with 2 suspects.Brett Partridge and Sherrif Thomas McCallister.The only reason that i pick the Sherrif is because i think that he can manipulate people more easily than Partridge.Partridge is younger and i just cannot see him as RJ.
