The show gets really cheesy, and I don't like the road they are heading but from what I understood from last nighs episode is that Kirkland has a twin. The twin that killed Jason Lennon in the hospital and the one that works for "tyger"/RJ organization. This could also mean that the list is not down to 5 suspects but remains 6 with only Partridge dead and Kirkland/Twin character alive.

Now what really bothers me is the whole organization thing. I feel that Kirklands twin maybe ran into Bret Stiles, went to Elison farm in '88 and thats how Red John was born? But the question who started "tyger tyger" remains. 
In my opinion It was started by Red John because we've seen multiple times people telling Patrick "Red John wants you bad Patrick" "Imagine the things we could do together" and so on.

But who is Red John? Could it be some messed up kid, like Kirklands brother, or Haffner etc that was killing randomly and then made this huge powerful organization or it was someone powerful like Stiles all along. I have no idea idea, so I'll just mark Kirkland on the picture since the last night episode was about him. But I hope that Bruno Heller will clear things up in the next episodes because we are only 4 eps until the big one where we see RJ and I'll be disappoint if many people are Red John.
Sorry for my inglando:) and thanks for reading.