This post is an expansion of my prior theory #5409. It explains why the other six names are on the list and why they act so shifty. It also explains why Red John works alone, even though it often seems otherwise.

Red John works alone but has an uncanny expertise in many things including forensics, servailence , FBI, etc. The other six suspects are collectively documented experts in these areas. This is no coincidence. They are being extorted by Red John to help in his exploits. Red John specifically picked each one of them to use as tools in his nefarious 'performances'.

Red John had damaging or embarrassing secrets on each of the other six, most likely through his link to Visualize. Red John contacted each of the other suspects anonymously through email perhaps and requested a 'favor' from them in exchange for not disclosing their secrets. The initial favors were seemingly benign enough where the six suspects chose to comply in order to protect themselves.

Each suspect eventually became aware who they had helped when Red John pulled off another one of his murders...At this point, they know they helped Red John, but have no idea who he is or even how to contact him. Moving forward, they have no choice but to continue helping him because he can blackmail them and end their careers with scandal. As time passes, some of the six suspects come in contact with each other while watching the Red John investigations unfold.

I think what we saw in season 6 episode 2 was a 'Red John Support Group'. -These guys have figured out at the others are involved and have reached out to share information in an attempt to bring Red John down. I don't think any of them know who he is, if they did, they would probably kill him themselves.

Bertram desperately wants to know the latest developments on the Red John case to pass them to Red John and keep him happy, but he is probably privately hoping Jane catches him in a manner where Bertram's 'secret' doesn't get out.

These six suspects have conflicted feelings about Jane because they would love for him to catch or kill Red John, but they don't want their secrets to be revealed when that happens. Also, there is probably some resentment towards Jane because many of the illegal things they are forced to do are to taunt Jane or obscure his investigation, so they also feel like Jane is hunting them as well as Red John. Tricky, no?

There are lesser characters who are willing fans or followers of Red John. Notice how their value to him is very limited to having 'hands' to carry out more visible dirty work. These guys always die in the end. RedJohn sacrifices his pawns to protect his prized pieces who can further provide him forced assistance or information. These lesser characters are societal outcasts that probably meet Red John through chat rooms or fan sites and he eventually selects the ones who will be blindingly loyal after providing them something they desperately want.....

A couple things one, some people are suggesting red john is a lefty because of a scene in episode one.  I believe it suggest he is a righty. Before you disagree with do an experiment take any object I used a pop can hold it in your dominate hand (most of us that would be our right) and try to manipulate with your non dominate hand it felt awkward to me.  I tried with a few other things it seemed that i naturally stabilize an  item with my nondominate hand and manipulate it with my dominate one ie hold the knife with the left clean it with the rigth.  
Another thing we should probably already know if rj is righty or lefty we have several examples of him drawing something.  A handwriting expert could tell what hand he did it with also they could probably tell if it was done by one person or several. In my opinion if reede is a lefty as suggested this eliminates him as a suspect i also believe this elimnate the idea that more than one of them has killed under the name red john (several may still be involved though)  Why think it betram I don"t know I always have thought it was from the first time he appeared Just some thoughts

Here's what I think happened in the 2nd episode of season six:

First Theresa's dream had lots of dark imagery, but who actually attacked her? Haffner!

Next, during Patrick's visit, the doctor came in looking for Carmen Lee.  I think Haffner  just wanted to know if Theresa was alone, and send the doctor in to check for him.  She waited around in the hall until after Patrick left, you can see her when he is on the phone.

Once he knew she was alone, Haffner came in to see if WHAT Theresa remembered, to see if she knew it was him.  He sensed she was nervous, but I don't think he believed she knew he was Red John.

It struck me how good his posture was compared to the other suspects, which was one of Sophie's clues.  He is also the correct age and body type, if the clues are to be believed.

It gave me shivers when he said that one day they would have "a time" in the future.  That doesn't sound like someone who is planning to get to know you for any length of time.

And the whistle, well, if you go read the lyrics to "Jimmy Crack Corn"  AKA Blue Tail Fly, they are about a slave getting away with murder, and are offensive by the way. 

I don’t know who is RJ. But I think we have to focus on RJ appearances.

Let’s take a look at 2x23 (Red Sky In The Morning) and 6x01 (The Desert Rose), when masked RJ appears and talks to Jane.
First of all, look at his body, watch his legs and feet (2x23). We can already exclude Reed Smith, Bret Stiles and Gale Bertram (pay attention to the legs!). 
Focus on his voice and the vocal timbre, try to imagine the remaining suspects saying those words.
This sentence is very important: "Sorry Patrick, Teresa can't come to the phone right now..." (6x01).
We can exclude Thomas McAllister (definitely not his voice), Brett Partridge (he's dead, and btw Jack Plotnick said that his voice was never used for RJ), and Haffner (the voice doens’t match – I know he’s the only one who calls Lisbon by her name but it doesn’t matter).

Now take a look at these 2 episodes: 

Ep 5x18:  “Behind the Red Curtain” 
- Kirkland talks to Jason in the hospital. Just focus on his voice when he’s whispering. 
- Jane arrives but it’s too late, then he asks Kirkland what happened. And Kirkland says “Patrick, I’m sorry…”. Compare this sentence with “I’m sorry Patrick..” (6x01). 
The similiarities with the masked man are fairly evident. Same timbre, same pronunciation.
 
I’m sure that Kirkland is the masked man. And I know that many of you will say Kirkland can’t be Red John, and you are right. 
The masked man, in fact, is NOT Red John, but his right hand. His Red Right Hand.

Ep. 2x08: Minelli speaks to journalists regarding his agents deaths. Right after that, Lisbon goes to talk to him, and he acts like he’s waiting for someone. In that moment you see a well-dressed black-hair man at the gate, he’s just arrived with a limo and Minelli is waiting for him. 
He’s Kirkland. 
The name of this episode is “His Right Red Hand” and this is the first time you see Bob Kirkland in Mentalist, right hand of RJ, arrived to keep an eye on the situation and sacrifice Rebecca in the end if she will get caught. 

Bob Kirkland is the most important RJ disciple (remember when he said at the hospital “I’m a friend. Let's face facts Jason. If you recover, and live, you'll spend life in prison for murder at the play thing of monsters. I just hope, that if I am ever in your shoes, I have a friend close enough to do this for me”). 

He did murders and stuff for his master, he seduced Rosalind Harker (the description fits).He was the patient of Sophie Miller. 

Sophie, in Black-Winged Redbird (6x02), said that RJ had probably a real phobia: Kirkland touch two times and polish off Jane's suit, in Behind The Red Curtain (5x18), without a reason. This is called Rupophobia, and also with other names, and is the phobia of dust and dirt. She said also that RJ is a good whistler: many suspect are seen whistle in this episode; but, for an istant, in Red Letter Day (5x19), we see Kirkland whistling in the office of Homeland Security.

Conclusion: 

>  Kirkland is RJ right hand. 
> Partridge is dead. Don’t know if he was involved.   
> Stiles and Jane are almost friends (they helped each other), and he knows information about RJ (for sure he’s not him).  
> Haffner – he can’t be RJ.   [RJ would never: Admit he’s from visualize - Not answer when Lisbon asked if he was at the barn - Said “I like You” to Lisbon / He’s neither rich (private agency of investigations – money from Visualize) nor powerful.]   
> McAllister and Reed Smith – they are involved in something but I don’t know if it concerns RJ   
> Bertram – my bet is on him. …….I feel some weird vibes…..   :)