My list of suspects:

#1:Raymond Haffner : He had a phobia just like Miller said. He has a lot of friends in the FBI , CBI and Vizualize. He is old enough to be Red John. The woman who entered the CBI told Patrick that Red John was from Vizualize.
#2: Jason Cooper: He appeared in "Red Tattoo" but he wasn´t one of the suspects and HE WASN´T INCLUDED IN THE INVESTIGATION. My point is that Raymond Haffner was there to represent Vizualize but ... what did Cooper do? Did he went there to represnt Haffner?!. He is also a suspect of Vizualize and the wowen told Patrick that red john was from Vizualize.
#3: CBI Ron: Bruno Heller used the expression : "Red John is like a "where is Waldo?" , and the only one who is closer to that expression is CBI Ron.
#4 Gale Bertram : He was in the extended list of suspects of Patrick. He is in the actual list. He was

one of the suspects of Todd Johnson´s death. In chapter 24 Season 3 he was nervous when Timothy entered the shopping , he didn´t stop to look at him. Another point that Timothy´s newspaper was in the same page AS BERTRAM NEWSPAPER!.
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Connections of Red John:

The only group that appeared was : Reede Smith , Thomas McAllister and Gale Bertram. I think that they are the head of the "Tyger , Tyger" group.

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RED JOHN: GALE BERTRAM