This is a crazy theory but there is a high posibilitie that red John has a very important connection with FBI agent Susan Darcy, considering the interest that she has on knowing about Red John. For example, howcome she was the first person to get suspicious about Red Jhon's death.? It is because she already knew Who he was. It is also weird that when Jane made the trap to catch red John in las Vegas, Susan Darcy started shooting at the car and she was the one that killed agent Luther wainwright , that probably knew red johns identity. Another important fact about that day, is that Red John was actually very near that car, because the phone that was connected to wainwright was a short distance phone. I am not saying agent Darcy is RJ, but she is connected to him. Another interesting insight is that as soon as Patrick finds out that he has met Red John, we can see him writing a list of names at the end of the episode Black cherry, and the name Brett Partridge is on it, but that might also mean we can role him out.