I have to admitt I love Wayne but I also agree that he could be red john because :

Red John likes the colour red and he had a relationship with the blind redhead and also rigsby loves van pelt the other red head. Wayne has a brutal streak as Patrick says when Wayne is hypnotised , he knows almost everything about Patrick and works with him everyday . Wayne's violent farther could have been in on this or even the blind red head.

The only reason that I disagree with this theory is that rigsby is that rigsby is so sweet and does not seem too smart.