I suspect that Robert Kirkland is red john because when he bumps in pj and patrick asks if he knows Kirkland he replies "no but I know you" he also shakes hands with patrick and at the end of the episode where we see patrick Jane's first case when the woman in the limo ( don't know her name) says that patrick used to be in an insane asylum she looks in to the front of the car and says it's done there sits Kirkland and he says "good"