I could be wrong, but in the message from Red John he never said that he actually IS one of the 7 suspects. RJ only revealed that he knew the names on PJ's list. RJ could still be somebody outside the list.
I could be wrong, but in the message from Red John he never said that he actually IS one of the 7 suspects. RJ only revealed that he knew the names on PJ's list. RJ could still be somebody outside the list.