I'm bored with no theories. So I'll make my own!
On Red Rigsby ; did RJ ever use hypnotism on people prior to becoming entangled with PJ? Rigsby seemed most interested in acquiring this skill. Rigsby managed to manipulate Cho, the master of morals, to lie for him during an internal investigation. Rigsby is no where to be seen when BP is killed. When seen in the reunion episode, he clearly has charisma he keeps on the lowdown. When he meets PJ he quite markedly avoids shaking PJ's hand. Rigsby is leaving the show. I tried watching the show from the perspective of Owain knowing he was RJ from the beginning, but no one else in the cast does. It kinda plays. He would be the perfect draw-dropper - other than Cho, of course.
I've said before (and had it misinterpreted and then trolled) but it is possible that Rigsby saw the predatory nature of the sherrif during the Van Pelt sting at the restaurant. That could have been when Rigsby recruited the sherrif.

On another note - when Haffner says to Lisbon in the hospital 'we'll have time soon' or something to that effect, I wondered if RJ has promised Lisbon to Haffner, like he did with the twin sister he 'gave' to the cop desciple.