Hello friends.
I just rewatched s5e13 The red barn, which I think is one the most important episodes on the show so far. In this episode we find out that Red John is/was a Visualize member and in 1988 he was in the Ellison farm. The two dead people in the basement are probably his first kills. He also painted the smily face on the wall.
Now this is very important because in the end of the episode Patrick tells Lisbon that he suspect around 408 people but the whole Visualize and farm thing will exclude "a bunch more". I think this is the best lead we got and the closest we can get the R.J for now and surely Jane knows this. So I think everyone on that list must have something to do with Stiles and his cult.
The only guy we know that is a Visualize member and most likely was in the very same Ellison farm in '88 is Haffner.
Now I really dislike the idea of him being our lovely Red John but we gotta consider everyone on that list, and the Red Barn episode is a very good lead.

Haffner himself looks really unsure around Jane. The fist episode that he plays - s4.ep2 he asks Cho who's smarter - he or Jane. Why would he ask this? We see in the season finale R.J tells Patrick via the CD - You think you are clever? I'll show you clever. Obviously theres something going on with those two. : )
Now my favorite clue about Haffner is his talk to with Lisbon. He says that he was troubled kid back in the days and Visualize help him. So we know he was bad teenager around 17. At 21 he was in the Ellison farm. This brings the question how come theres so many trophies in his office? When did he graduated high school and college? How come he achieved so much if at 21-22 he was working for Stiles and had no promising future if any future at all. There must be something that he did to earn Stiles or someone else trust, to build connections and eventually make it to CBI.
Another think for Haffner, bit of a long shot tho - but I think I noticed a football/sport award from college in his office. Do you remember when Jane was kidnapped by those kids and R.J saved him? At the end he said "Roll Tide" - a reference to Alabama crimson tide sport team.

After all I like the idea of Partridge being R.J the most. We all know about the Blakes painting "brace of partridge" etc. I love the idea of Brett Stiles being possibly father, uncle etc of R.J and thats why he helping him. But theres a reason for everyone being on that list and I think in next season they will make the Red John - Visualize connection more clear for us. But for me theres no doubt that Stiles knows who RJ is but he won't tell either because the cares and protect R.J or because hes afraid of him. Hes afraid of Visualize, that is a religions organization, being linked with the most brutal and famous serial killer in CA.
Sorry for my English, not my 1st language. And please feel free to add something.