Sorry for the wall of text but i have many to say!
Okay 1st of all i'm now pretty sure Red John was in Visualize.And most of his accomplices are from Visualize too. Remember the bald cop that took the gun and mobile from the body of Timothy Carter?He is shown as a visualize member in an another episode.Ray is 100% associated with Red John.
Next i think that someone from Lisbon's team is helping or WILL help Red John.And i'm between Lisbon and Van Pelt.Lisbon is getting a bit upset everytime Patrick tells about his ''suspect list'' when Patrick started the list Lisbon was asking him if she was in the list and that he should write her.Now at Ep13 she seems a bit nervous about the names jane has and asks to now (But there is a possibility that she is nervous because Ray may be involved to the murder in 1988 and RJ). BUT VanPelt is a strong possibility to be/will become a part of the chain with RJ
Why?
Val Pelt agrees and likes with the ideas of Visualize.So i think in some part of the show Red John or some of his friends will approach Van Pelt and at the end they will manipulate her.
Anyway everyone connected with Visualize is highly suspected from me to be a friend of RJ.
But who is RJ? Heller told that we may seen him already ( like Waldo as he said) at the background and that he may be already in the cast. I was always between Brett and Washmourn BUT i never noticed ... RON from CBI!
Think of it: He is in many episodes doing almost nothing (maybe he talks for 1 sec) , he is many times in the background , at last episode he is the first to congrats Lisbon for the 10 years anniversary. He fits in the description Rosalind gave.But the one thing that made me believe more to that theory is that in one episode you can see Ron's ring in his left hand.A similar ring can be observed in the scene when RJ is drinking some tea while Rosalind calls Jane.Watch the ring and you will see some similarities.Anyway that's my thought what do you think?