For some reason it posted my other theory as "Murphy" ??? Anyway just also a thought on Mashburn. He may have been the Mitchell Washburn on Sophie Miller's list and therefore Red John, not J Roth. J Roth is so obvious - he knew Patrick would be looking for him on the list, and RJ didn't want his files etc found. Seems funny to me.
Not actually sure it is Mashburn, it only just crossed my mind. I have also been suspecting Haffner.