In my previous post I stated that I believe Haffner or McAllister are Red John and I went with Haffner. But now I have to adjust that to McAllister. So here is my summary again:

http://www.whoisredjohn.com/See-a-theory-Red-John/5451

So yes, I now firmly believe McAllister is Red John. Same reasoning as stated above.
Have a nice Day :)