First I would like to say something about the list, we all have to assume this is the only list, as we all known Bruno Heller already confirmed it. We have to let go our thoughts (me included) about the characters that we believed were Red John and they were not… Well, I will try to remove some of the suspects: Let s see when they appeared:  
-Bret Stiles (Malcown McDowell): Appeared in 4 episodes: (2x20) (3x3) (4x16) (5x8)  
-Gale Bertram (Michael Gaston): Appeared in 12 episodes. (3x1) (3x4) (3x13) (3x16) (3x23) (3x24) (4x1) (4x2) (5x1) (5x3) (5x14) (5x16)  
-Raymond Haffner (Reed Diamond): Appeared in 2 episodes. (4x 2) (5x13)   
-Reede Smith (Drew Powell): Appeared in 1 episode. (5x1)   
-Bob Kirkland (Kevin Corrigan): Appeared in 6 episodes. (5x5) (5x7) (5x8) (5x16) (5x18) (5x19)    -Sheriff Thomas McAllister (Xander Berkeley): Appeared in 1 episode. (1x2)  
-Brett Partridge (Jack Plotnick): Appeared in 4 episodes. (1x1) (2x23) (5x15) (5x22)  
 “Red John has been visible in prior episodes” (after season 3) 
OUT KIRKLAND, SMITH AND HAFFNER. 
Plus, Jimmy Gadd, one of the Lead Editors on The Mentalist, said on Twitter “Kirkland is A GOOD GUY” (I will try to put the photo in the Argue) 

SO BRETT PARTRIDGE, SHERIFF THOMAS MCALLISTER, GALE BERTRAM AND BRET STiLES
We saw a list of everyone Jane has ever met and shaken hands with. Jane simply named every single person he’s met and shook hands with, and we saw just one page of many in his little book. What we can see there is that Jane makes the list with all the persons he shook hands AFTER Red John killed his wife and daughter. So, it is not a person from his past. Well, and the big question is how Red John knows about Jane's happy memory from his childhood? Jane doesn’t t believe in psychics, here is the conversation between Jane and Van Pelt when they first met: 
Grace: Mr. Jane, I have a question regarding your previous career path.
Jane: Fire away.
Grace: When you met with other psychics, real psychics, could they tell you were just pretending? 
Jane: There's no such thing as real psychics.
Grace: I beg to differ. My cousin Yolanda is a psychic. 
Jane: Your cousin is deluded or dishonest or both.  

Jane says what Red John did was a trick, and Jane knows about tricks, he does those tricks all the time, in almost every episode. The difference for us is that sometimes Jane explains how he does those tricks, and now we don t have the explanation, so it looks like Red John is God.
In episode 1x18 Jane says: 
Jane: Hypnosis is just a way to connect to the imagination rather than the conscious mind. The mind will accept whatever the imagination creates, however bizarre.  

According to the description of Rosalind ("just under 6 feet tall”,“short straight hair”) 
MCALLISTER AND BERTRAM ARE OUT . SO WE HAVE BRETT PARTRIDGE AND BRET STiLES.
If it s true that “a kid” painted Red John face in Ellison Farm (we can argue which are the parameters of age to say that someone is a kid) it fits best BRETT PARTRIDGE. 

I WOULD NOT BE DISAPPOINTED IF BRETT PARTRIDGE IS RED JOHN, I WOULD BE DISAPPOINTED IF THE CLUES (INTERVIEWS, WRITERS, TWITTER, ETC) ARE NOT TRUE!!!!!!!!!

I put forward theory #2905 just under two days ago, wherein I argued reasons why I felt Red John was Patrick Jane, or if not him then one of the core four. Failing that, it absolutely has to be someone we were introduced to in the show's pilot episode given my reasons in my post (#2905). 

Rewatching the season 5 finale for the 5th time (yes 5th), I can't help but suspect Brett Partridge even more. I had urged everyone who read my post to pause the finale at the second Partridge turns to face Patrick with the Red John smiley face dripping on the wall behind him. I don't believe people bothered, therefore I am urging you now to look at this screencap I have taken, before it gets taken offline:

https://plus.google.com/u/0/photos/101232154949211716790/albums/5875750306743394993

Coincidence that his face matches the one behind him exactly, yet by the time he has finished turning he looks innocent and surprised at Patrick's presence?

More to come...

As everyone seems to be discussing how RJ knows about PJ's memories, specifically his happy memory of that girl from his childhood, may I offer a theory?

Kirkland has been following PJ's movements since the beginning and was aware that PJ was in a mental institution prior to entering the CBI.  As he seems to be able to access any information he wishes, isn't it possible that pycho-analysis sessions at the insitutition could hold record of PJ's past including memories and inner-most thoughts?  This information could then be readily passed along to RJ.
I believe that Kirkland is, at minimum, an associate of RJ, but I feel his on-screen actions make him "too-likely" to be RJ himself.

As for the wrist-brace on Lisbon:
IMO, she made some attempt (to be shown perhaps next season) to get into PJ's room to see his progress.  I feel she truly loves PJ but does not yet fully trust him.  I think PJ noticed the potential break-in, hence his expression when she says she tripped.