I think Raymond Haffner is Red John. Here are a few things why i think so :
He is in supreme fysical condition. In s06e01 you can see Haffner lifting weights at the end which confirms that. This matches Rosalynds dwscription of Red John, and the description we got from dr. Millers voice memo. He is also in the position to get a good view of the progress on the Red John case, and temper with evidence. He also has short, style hair. (Rosalynds description). And the fact that he is a member of visualize makes it more and more likely he is in fact Red John.
Sorry for my bad english :)
