1.) Patridge is dead! Get over it. He is not RJ. I think RJ killed him because he found some evidence against him.
2.) Kirkland is NOT RJ. It is impossible! If he hadn't had a face surgery (which i strongly assume, because that would be just cheap and lame) he cant be Red John, because Lennon would have recognized him as RJ. So it is impossible that he is RJ. I really dont understand how people can keep saying he is Red John. He is also not after Red John, because he would have asked Lennon to tell him who Red John is. He works for Red John, - as simple as that.
3.) Stiles is NOT Red John. It is impossible. Stiles was already the leader of visualize back at the time when the RJ smiley was painted on the ellison barn. The priest said some kid painted the RJ smiley on the barn, - do you really think anyone would refer to the LEADER of Visualize as of some kid?! He would have simply said the leader of visualize painted that smiley on the barn. So it is absolutely impossible that Stiles could be RJ. Not because of his age, but because the leader of visualize was back then not just some kid.
4.) I cant say for sure Reede Smith is not RJ, but I just think he isnt. I dont have a valid reason why he is not RJ, but I just dont see him as RJ.  Neither is McAllister. Thats just my opinion, I cant give proof for that. But I think that McAllister and Reede Smith were in Bertrams office not because they are allies of Red John, but because they are up to something else, a secret project or some dark and illegal affairs. The fact that Reede Smith told Bertram, that it is his job, to find out, how much Jane knows, I think he wasnt refering to how much Jane knows about Red John, but how much he knows of the stuff Bertram, McAllister and Reede are up to.
4.) My strongest Red John suspects are Bertram and Haffner. Till end of season 5 i was convinced RJ is Bertram, but after season 6 episode 2, I have that gut feeling that it could be Haffner.
Reasons why Haffner could be RJ:
- Haffner is a known Visualize Member. He could have been at Elliston Farm.
- Haffner said in one of the episodes to Lisbon, "that he was a kid, that was heading to a bad direction and that Visualize helped him to straighten him out." - What if Visualize tried to straighten him out but didnt succeed? Maybe Haffner tried to become better with the help of Visualize , thus didnt kill for many years, but at the end his evil traits won and he started killing again. This would also explain why Stiles knows who Red John is (Haffner), but at the same time, doesnt reveal the identity of RJ/Haffner, because he doesnt want Visualize to get into trouble.
- If Haffner is RJ, then Jane didnt trick him to lose his job and to get Lisbon back as the boss back in season 4. If he is RJ he wanted it and did it on purpose, like in "His right red hand" where Rebecca said that he wanted him to be back on the RJ case". RJ wants Janes team to be after him.
- The psychiatrist said RJ has no family. If Haffner came as a child already to Visualize it indicates that he has no family or family ties. He is also not married.
- Unfortunately we dont know much about Haffner that could prove that he is RJ.

Reasons why Bertram could be RJ:
- betram military bravery award in his office from the gulf war. Carter, who he killed was a veteran from the gulf war, could be a link there.
- Bertram is a passionate fisherman. (as you can see in his office)
- Bertram said to Jane in S06 E02: "Why did lisbon go into the house, because when the call came in, neither Red John or Patridge was mentioned." - I ask myself, - how did Bertram know, what was said in the call to Lisbon, if he didnt call himself?! This is a bit thin, but worth taking into consideration.

I am more inclined to Haffner, - I have the feeling that Bertram might be only a Red Herring. Happy to hear your thoughts here.