I have a couple theories what if those 7 people were really Red John but then there was a head Red John  where those 7 people were getting their instructions from? and what if theose 7 people didn' t know who Red John was just a voice they they heard. Possibly it is Jane.  My other theory thinks that red john is still  Patrick Jane think of Leonardo's character in  Shutter Island Jane is trying to catch himself or like  the psychiatrist in The Ninth Configuration. Or who knows it could be Patrick' dad