I think what people have been saying about the 666 theory is correct.
You see the numbers at the end of 6x01 where BH said there was a clue to RJ's identity. 

If you type Red John you get 666 and if you type Gale Bertram you get 666
If you type any of the other suspects you don't get 666.
http://www.openjs.com/scripts/666.php

Not taking credit just saying it makes sense.