Firstly, i'd like to begin with saying that Van Pelt is not Red John

Now that's out of the way, we can get to business. Van Pelt is the most interesting character on the show IMO. I find it strange that we're into the 6th season now, yet we still know very little, if anything, about Grace's past, whereas every other team member has been given their own backstory-centric episode. We learnt about Lisbon's alcoholic dad, and the fact she acted as a surrogate mother to her brothers, we learnt about Cho's gang and military background, we learnt about Rigsby's troubled past, and we've learnt a lot about Patrick. But nothing really about Grace. All we know is:

- She's from a small town
- Her father is a football coach
- Her cousin is a psychic
- She's emotionally shut down
- She has a bad memory that she's not willing to share, even with Rigsby
- She's fascinated with Visualize and the occult
- She's very capable with technology

That last 2 points for me are important, given RJ's Visualize links, and proven technical nous. We learn the vast majority of those points during the show, in the present, no flashbacks or backstory episodes, again, different from the other characters. We learnt through backstory that Cho is tough, unflappable and very reliable. We learn that Rigsby has a mean streak inherited from his father etc.

Something that dawned on me, from rewatching season 5, she has a lot in common with Lorelei Martins. Both are beautiful women with troubled pasts, both are tough and physically capable, both are easy to manipulate, both would be an ideal target for a serial killer with a cult-ish following. My guess is that RJ recruited Van Pelt much the same he did with Lorelei, harming someone she loved without telling her, and rocking up and playing the hero/shoulder to cry on. 

So my theory is that GVP is RJ's CBI insider (Ron being a red-herring), and RJ's technical expert. Note that RJ only seems to contact the CBI via Grace (like the Dr. Joe N.H part). 

I have no idea who RJ is though. 

Not a theory, but surely Rosalind Harker must be lying about the physical description? If not, then wouldn't have RJ killed her already? He normally kills his minions when they're no longer needed, yet she's still alive, which suggests to me that she still has a purpose, and that is to throw off any potential invstigators by purposely giving false info.

On that logic, working to the opposites of the given description, RJ must either be:

Very tall or rather short
Muscular or fat
Bald or have longer/curly hair

Only one man really fits all 3 points: Gale Bertram (tall, well built, bald(ing)), but he would be too obvious, and this show doesn't like obvious suspects. 

Reede Smith is chubby, so he could be considered, plus he's confirmed to appear in episode 6:08 (Red John), as well as 6:02 (Black winged Redbird).

Also, i'm unsure as to how genuine the suspect list is. I know Bruno Heller has said it is legit, but Bruno Heller also said that the guy in 3:24 was RJ, and we know how that turned out. Wouldn't surprise me if he was lying to protect the script. 

I think its ray haffner. and for all german fans: take a look an http://www.facebook.com/weristredjohn

i found that page yesterday and i really love it :)

He calls always Agent Lisbon in the thirteen episode of season 5 ``Teresa``. In the first episode of the sixth season, Red John said to Patrick Teresa can't come to the phone. I never saw in the serie another person than Haffner who call the first name of Agent Lisbon. He's certainly the serial killer because he is the only person who call the first name of Agent Lisbon.

Regarding a solen fake list, could that be Kirkland's list that PJ set him up to take. Remember PJ smiled once he noticed that someone entered his secret place. So it could be that Kirkland is now is after killing all the fake RJ. 
The "Do you recognize me??" to  Lenon might just be Do you recognized me as the man who is after RJ.

Sorry if someone already posted the same theory regarding the stolen fake list

I am accusing Brett Stiles but the system did not allow me to choose anyone else.