I saw some things on the Kirkland twin thing and something just came to mind.
In season 6 I believe called red listed Bob Kirkland tries to scare Jane by cutting off the other guys fngers.

Now in the episode where Jane meets up with RJ and Loralei in the car season 5, RJ asks him to join him PJ refuses and Red John threatens or tells loralei to cut his fingers off also.

My point is Bob and his brother use the same tactics. I think Jane noticed that in Red listed.