Just summarising theory #7461.

http://www.whoisredjohn.com/See-a-theory-Red-John/7461

Jason Cooper says in Red Barn that "The police never took reports from Visualise seriously (25 years ago)." That's why they supposedly didn't report the barn murders. So Visualise, start to recruit people from law enforcement, while the younger members who go into law enforcement get a leg up in to then, newly formed Tiger Tiger organisation. Redjohn grows up and takes over.

Brett Partridge is a fake name, made to show to those in the society, that he is the leader.

Brett - son of Stiles
Partridge - William Blake theme.