Ok this is not really a theory but just something that kind of grabbed my attention and also i have not seen any posts of this, in season 6 episode 1 when Lisbon enter the house we see the 666 written on the wall, as we all know episode 7's title is "The great red Dragon" Ref made to the book of revelations. Now what if the 3 dotted tattoo was the mark of the beast?

some clues that Heller included dont really help us much like for example Red john is a good whisler, he has a phobia that not really much to go by.