I know Haffner was pushed as RJ during 6:05, and normally that would lead me to suspect someone else, but in this scenario, i'm actually going to go along with it. My reasoning is:
1. He's a perfect physical match for Red John
2. His walk is a perfect match to RJ
3. The way he grabs people's shoulders is a perfect likeness to the way RJ did to PJ at the end of Red Sky in the morning.
4. He has a genuine phobia
5. With PJ and the other 4 suspects, their relationships are more of a mutual distrust, PJ and Haffner flat out loathe each other.
I know some will wonder "If Haffner is RJ, why hire someone to bug the CBI office?" Simple. Distraction. You wouldn't want to draw attention to yourself if you were a notorious serial killer, so have someone else do it to draw attention away from yourself.
