I haven't been back here since last Sunday so I have to read some more entries. However, this has been a fun place to theorize and see how other viewers' minds work. One question: if you "don't give a shit who Red John is, why are you here." But the answer is clear: you do. The Mentalist is a really well written show that goes much deeper than other detective dramas. See "the forest for the trees". We have all become "mentalists" because of Patrick Jane and the brilliant writers.
With that said, and without reading more theories before I say this I say "he is Mas..."- Walter Mashburn. He is the only other interesting, charming and multi-layered character like PJ. And he is the only man who we know had a fling with Lisbon. How ironic...
Thank you, show, you have taken me into an interesting world.