The William Blake Poem Tyger Tyger seems to be a significant
clue in not only the identification of Red John but also his relationship to
Jane.  The line which ends in “frames thy
fearful symmetry” is the part that resonates most for me.  Just a thought….not a theory…Bob Kirkland
could be Patrick’s twin / brother. 
Kirkland is evasive when discussing his hometown with Lisbon, saying
only that he traveled around with his parents work and he considers himself
from “America.”  Travellers is a term
also used to describe what the series refers to as Carnies.  Also, he drinks a  bloody Mary when he is reviewing the Red John
wall copied from Patrick’s loft which is the same drink Patrick has on the
Anniversary of the murder of his wife and child.  As I said, just a thought…