So looking at the promo for episode 4, i think it is clear that Rob Kirkland is not red john. He must be looking to kill red john himself in some sort of personal vendetta or just simply wants to catch him. He sure seems like he would do anyhting to get to red john (kill that guy at the hospital, torture jane as seen in the promo). But he got the fake list jane left in the room and he is going after the wrong people. I think now he has realised and thats why he tortures jane to tell him the real list.
I know promos can be deceiving but it looks pretty straight forward, i think we all new kirkland was tricked by jane, because jane smiled when he saw they had entered his room. But now it seems kirkland may be killing those fake suspects or something like that, thats why jane is worried and tells it to lisbon