Alex Jane is Red John ( or maybe after his possible death some unknown ( twin-) brother of Jane )
Also probable Patrick has a brother (or sister ) he never knew
We don't know anything about Patrick's mother. I can imagine Alex Jane and his wife having had 2 children and that they were separated at the divorce. Alex took Patrick with him
Regarding Alex's temper and his anger at Patrick running away and taking away Alex's income, I can imagine Alex being Red John.
Remember the settings of Lorelei's death = carnival scene

The old Greek drama-writers would have loved the brother-dichotomy, one good and one bad