I often wonder how a serial killer have this much power over police forces and know political figures. the answer I came up with is that they don't know they work for RJ. So he have to have a powerful job, like being the head of CBI. I don't think red john is a simple guy working at CBI like Ron. He can't be jane or anyother main character, simply imposible for them to pull of something big as this(how would they have moles in fbi?). I am not sure who red john is but I wish, I helped you eliminate some of the options..