In 2x8 (His red right hand) we learn about another operative for RJ. I suggest watching this episode if you haven't seen in. Reveals that RJ is in fact human and capable of making mistakes.

At the very end of the episode, RJ (we presume because Rebecca smiles lovingly at a character walking towards her) kills Rebeca. The clip is below.

http://www.youtube.com/watch?feature=player_detailpage&v=1otRlA3PedI#t=82s

Most importantly, at 1:25 you can capture the back of the presumed RJ head. Dark hair, cut short. He is dressed in the same uniform as the other officers. You would need to presume then any of the suspects that would have "normal access" there would be recognized by other employees. And therefore would be suspicious if they were in a officer uniform. (i.e. partridge or bertram). 

The most likely case would be Kirkland. 

I saw someone post this the other day and wanted to dive into it a little further. 

First, the list. I trust the list for two reasons. First, Bruno said it is legit. Second, when you look at Patricks face as Lorelei reads the names, he is clearly showing discontent. Expressing that he was set back yet again. 

Now onto the meat. Bob Kirkland is the only suspect on the "list" that Jane hasn't "defeated" mentally in some sort of challenge. In addition, he is the only one that Jane hasn't even challenged. He is the only one that has had an upper hand on Jane. 

From that angle, the only one else with that sort of criteria would be Stiles. However, stiles doesn't match the description we have. 

Like most people I'm thinking that the list we saw isn't the real list at all, I know Heller said that Patrick's list is legit but he didn't say that that list was Patrick's list did he?

I'm thinking that that room and everything about it was a decoy, I reckon that Red John has had hidden cameras in that room for a very long time and Patrick subtly noticed them and started misdirecting Red John with his 'investigation'.
Almost every season 5 episode we're reminded that Patrick has a perfect memory so why would he need to write the names down at all if not for someone else's benefit?

As for who I think it is, my strongest suspicion is Patrick's father (I'm not sure why Patrick made his list based on people he met after his wife and daughter's deaths), but I don't think it is too farfetched to think that maybe he had plastic surgery and is now masquerading as someone Patrick knows, probably Kirkland considering his deep knowledge of Patrick.

How did Red John know Jane's Happy memory ? Well Here's my theory
I'll try to explain so please comment if there's anything to add or any thoughts.

Dr Joe.N.H is one of Red Johns Aliases like Roy Tagliaferro, he used the alias "Dr. Joe - N. H." ("N. H." being short for New Hampshire) in "Red John's Friends" when instant-messaging with Lisbon's team. . In Red Dawn we discover Jane was admitted to a mental hospital because of his wife and daughters death . In order for you to be admitted you have to have a mental illness. Because Jane's Daughter and wife were murdered and he was the one who discovered the bodies it was more than enough to be a trigger , along with the stress of red John personally targeting him and dealing with a number of emotions. Very often, psychosis can be triggered by stress, extreme or otherwise.  Different people deal with different types of stressors in different ways.The amount and type of stressor that can trigger a psychotic episode varies from person to person because, as noted, people differ in the degree of their vulnerability or predisposition to experiencing a psychotic episode, and how they deal with stress. 

Psychotic episodes usually occur in three stages:

1. Prodrome
The prodrome is the initial stage of psychosis. Early symptoms may be vague and not distinguishable from and individual’s normal behaviour. Changes may be slow and the person and people who know them may not notice these changes straight away. 
(In Jane's case his symptoms must of been noticed right away)

2. Acute
The word psychosis is used to describe a condition that affects the mind, where there has been some loss of contact with reality. This can lead to changes in mood, behaviour and the beliefs a person holds.

3. Recovery Psychosis can be treated and most people recover, and with the right help many people will never experience more than one psychotic episode. Therefore, it is vitally important to seek help at the earliest stage possible; this is commonly the role of family or friends.

In Red Dawn we see Jane wander in the CBI. First off, Patrick did in fact give off a homeless vibe, as Lisbon put it. He looked completely disheveled with his hair askew and his inability to tuck in his shirt. This was not the charismatic, confident Patrick Jane we know now. This was a man who was just released from a mental hospital. If you watch closely its almost as if Jane set up the punch in the face intentionally . Lisbon says Jane agrees he provoked agent hannigan who punched him Minelli says " I hope Mr Jane remains so amiable when he wakes up in the morning with a pounding headache and time to think . We must find a way to make him happy " So Jane being a Mentalist , he can read people using clues and he did pick up on agent hannigan's anger issues; Triggering it so working for the CBI is leverage so he wouldn't sue. Minelli even offers Jane to run along with Lisbon on duty . Where he shows off his skills and swindles the team and all in letting him work with them.  

Since Red John can be 7 Of those people we have to stop being so fixated on height and appearances as much as we'd like to think they help . They do up to an extent but we must go into a much deeper thought, Like the past of Red John .

Speculations:  

*Red John Worked at Visualize at some point time Or was a member of visualize 
*Red John has some sort of medical knowledge (previously a doctor or psychiatrist ect.)
 
Its fair for me to think that Visualize is what has helped to Red john to become as sharp or almost as sharp as patrick .Red John is extremely intelligent, a match for Jane, as seen from his ability to outwit him time and again.   He has twice hacked into the CBI computers without being detected. He sets up phony companies and bank accounts to keep his identity a secret. Possibly a symptom of his narcissism, Red John also appears to pay close attention to talk shows (or subscribe to a service that picks up mentions in the media) in case he is spoken of unfavorably since he kills the people who do so (such as James Panzer and talk show host Jacqueline Sandoval) on the same night that the shows on which they denigrate him air. Finally, Red John is a master manipulator, evident in his ability to get people to trust him. 

While Jane was in the Mental hospital whose to say he wasn't Jane's doctor ? . It's possible that he's came into contact with each and everyone of the people on the list & That he might be one. And if he has then i truly belive that He is Robert Kirkland . Roberts is somebody who easily charms and is very cocky , slick , suave .  

Remember Kristina Frye ? Somebody who is very mastered at the skill of hypnosis would only be capable of mentally stripping them of their true persona which is what Red John did to Kristina . MK Mind control is a sick sadistic way to hypnotize people and make them forget who they really are . 

Back to Psychosis 
 In the final stage patients are in touch with reality and remember , since their memory and pure conscious state is back . Patrick being in this state must have been worked on for a while and how is it that he doesn't remember who is doctor is ?  Perhaps DR Joe N.H ? And maybe the Mental asylum was in New Hampshire . . A fare possibility is it not ?.

Notice how Red John New the List of 7 suspects ? . Red John is NOT a psychic and we should be able to know this because he holds  the same powers ( maybe more advanced) and reasoning as Jane . The only way he knew this was Red John being Robert Kirkland OR Lisbon  being in cahoots ( very unlikely) and Robert having the other 6 people working for him . 

Jane is more clever than he shows and it is likely in Red Letter Day that he put the toothpick there because he knew someone would want to get in . Kirkland maybe . But this is as far as ive gone and if anything needs to be added feel free to Comment please

FYI cutiron = roytagliaferro . . maybe he cut iron while in visualize . .