Not saying he's RJ just want to point out a spooky detail the directors put there to freak us. Play again the nightmare of Lisbon. Look very carefully when camera focuses on dead Wayne's face. His eyes look to the floor and just the last moment they look right at the camera! Spooky!
Also in the same scene, all three are covered in blood except for Jane although Reede is next to him with his hands all bloody! His cup of tea is next to him on the floor and it's still on its little plate, and not even broken! Strange.

So if Partridge is not dead, Jane can't do nothing to prove it, right? The people who cover up his false death would not let Jane anywhere near his body, right?
So Lisbon is taken away with the ambulance. I would think they would clean her face in the ambulance or if not then when she gets to the hospital first thing. Since she has no wounds I mean. But Jane is in a harry to clean her face right there. Is he taking a sample of what is on her face, maybe?

I chose Minelli because I believe it was supposed to be him in the first season ("HE IS MAN..." scrawled in blood by the victim of Red John on the bathroom wall).  However, the show became very popular, and people began guessing Red John was Minelli, so they had to change it.  They got rid of Minelli and began airing more episodes.  Fans were happy and the network was happy.  Then, in the final episode of season three, Patrick finally confronts Red John in the mall and kills him.  The voice matched, the mannerisms matched--it was Red John.  Fans were thrilled, but the show had to go on.  In order to have more successful seasons, Red John had to "survive," hence the "mistaken identity" in the mall of season three.  Bottom line is that Red John is whoever the network needs him to be in order to keep viewers watching. 

I believe that Van Pelt is definatley connected to red john. There is a picture on the website screenshot.com/the mentalist season 5, which shows all the main 5 characters on it. Jane is sat on a couch flanked by cho and lisbon which shows they are his closest allies. rigsby and van pelt are stood up. rigsby is facing the 3 on the couch where as van pelt has her back to them looking at them in a mirror. I think this is a message from the writers to say that van pelt is not all she makes out to be.
I agree with many theories that van pelt has lost a family member due to Janes con artist scams and therefore is working with red john to destroy and hurt Jane.
I think she used O'loughlin and then was given orders to kill him by red john. O'loughlin was sent to the safe house by red john to be killed by van pelt.

I think van pelt is red john because sche is a man who was transformed into a woman. She also has red hair which fits the name and sche also has a relationship with the devil. Sche also tries to withstand jane a lot so which would imlply sche's got something to hide. 

Sorry for bad english im russian :D

Theorizing that Grace Van Pelt is a member of Visualize based on how she defended their philosophy in "The Red Barn". Red hair, Visualize member, her cousin's a "psychic", engaged to known Red John accomplice, joined CBI same time as Patrick... she is not Red John but it will pan out that she is involved, even if not directly (e.g. Red John's daughter).