Hey I'm the guy of McAllister theory before episode 6x8 even began.
http://www.whoisredjohn.com/See-a-theory-Red-John/11543
I am staying with this theory, but something really interesting popped into my mind.

Let's call this theory "Resurrection"
It's funny that two of my prime suspects are now allegedly dead.
In my previous theory I stated that Bruno Heller had to show Red John in season 1, because he didn't know whether his show would get cancelled or not.  That's a fact, not one creator can predict that.

The two people of the suspect list that were shown are Brett Partridge and Thomas McAllister.

Brett was dead and Thomas was still alive. Episode 1x02 especially the Rock Paper Scissors game was actually the first game between Patrick and Red John.

But but but, I am doubting a little now. I still think it's him but now I'm doubting that Brett is still alive and that he could be Red John, let me explain why.

It's all about the body that was shown to us. The face wasn't shown, but it could be a simple explanation that Jack Plotnick isn't acting Brett anymore or he doesn't have time. My main thing was his left shoulder, it was knifed out. Why would someone do that?
This is the fun part: I think it could be a body that was used of a TygerTyger person as Brett Partridge's body. And that Red John removed that tattoo of the body. Remember Red John always uses a knife.
And my other concern was, why would a morgue guy tell Cho that the body of Partridge wouldn't be recognized anymore, it's too weird. He wasn't even buried in the ground. Every morgue keeps victims of a crime scene in a refrigerator, the reason for this is that everything stays intact for an investigation, this means also the face.
The writer of episode 7 'The great red dragon' told after the episode was shown to the public that we can expect a big twist again in episode 8.

I can tell you one thing and it will be a shown fact. One of my two suspects is going to be resurrected in episode 8 as Red John.

Sheriff Thomas McAllister "the owner of the vault where Bertram stole all the things under the name Thomas" Hence there was also wine what references to Napa county.

Brett Partridge "The ghoul" The definition of ghoul is a gravedigger. He is a forensic expert and an alleged Red John fan. As a narcissist you just have to love yourself.

Brett Partridge or Sheriff Thomas McAllister.

Our answer will come next week.