As an organization, i think all of them has already had a role as red john in some point. That explains the different descriptions about him. But again as an organization, there must be a leader, someone with power and capacity to convince people to make such things for him, even sacrifice. And i lke Stiles for this. And as you can see, so far in season 6, there's almost no focus on him, just like Heller does with the guilty ones.
