I'm sorry, but Partridge is dead. All of the people out there thinking he is still alive is just flat out wrong. He was a part of the Tyger-Tyger Organization and got killed by Red John (my guess is because Red John thought that he couldn't handle being questioned by Jane). Kirkland's twin brother is interesting, but I'm not sure if his twin brother really killed Lennon, I just think it was Kirkland's rage. In that scene, he asks Lennon if he recognized him, I don't think Michael Kirkland would do that. He wouldn't have a reason to.
Also, I think that Red John is a part of the Tyger-Tyger group. I don't really have an basis for this, but it's just a hunch. When Kirkland talked to Reede Smith about the organization, it was clear that Kirkland only wanted Red John, and that organization could give him a lead to Red John. The only real reason that Reede Smith would have to kill Kirkland is so Jane couldn't talk to him about information regarding Red John. Therefore, Red John is a part of this organization and had Kirkland killed (Also when Red John saved Jane from being murdered, he said tiger-tyger to him). However, I don't believe that Red John is a group of people, it's got to be one person.
Now on to the five remaining suspects: Smith, the sheriff, Bertram, Haffner, and Stiles. Stiles hasn't really been in this season as of yet, so I will ignore him for now. As for Smith, if he is Red John the show will suck. He doesn't match the description of Red John at all and isn't methodical enough. As for the sheriff, and Bertram. They are clearly a part of the Tyger-Tyger organization. However, I don't think any of these people are Red John. In the scene from this season where Jane walks in on them talking to each other and then leaves, Reede Smith tells Bertram that it is his responsibility to find out how much Jane knows about Red John. Red John wouldn't be spoken down to like this, so Bertram isn't Red John. I also find it hard to believe that the sheriff would allow Reede (the hitman of the group) to give the orders to Bertram if he was Red John, so the sheriff isn't isn't Red John.
That leaves Haffner and Stiles. To me Haffner has been the front-runner from the very beginning. He is the perfect Red John. His age, his demeanor, and the way he has a "thing" for Lisbon. It's also hard for me to believe that Stiles (the head of Visualize) is Red John. I believe he is very similar to Red John, in his characteristics, but he is too obvious and too old. In my opinion, I think Stiles is Haffner's dad/uncle, and that's why Stiles won't give any information on Red John, but clearly knows him pretty well. It would easily explain Haffner's involvement in Visualize as well.
