Corrections:
've loved this showed and followed The Mentalist since the very first episode. It's been my favorite television show for many years. I loved all the literary allusions and clues as much as any of you, but Bruno Heller and the other producers killed the plot.
Mentalist Producer Szentgyorgyi told Deadline, "We started plotting out a conclusion to the Red John story about a third of the way through season six. 
http://deadline.com/2015/02/the-mentalist-series-finale-original-ending-jane-lisbon-cho-future-spino....
So that's it. All the clues were pointless. In my mind Brett Partridge was the real Red John. Grace and Rigsby should have been killed by RJ and Patrick Jane never should have had a happy ending.
I'd like to thank the creator of this fansite and Stoopkid for never giving up on crazy theories.