I'll throw this out there, agent Stephen Hannigan. He was in the flashback episode "Red Dawn" He got out of the unit real quit after Jane came aboard. He liked torturing Jane enough to make him sick at the crime scene. He
punched him in the face. He made it way too obvious that he didn't like
him. One issue to get around is that you don't actually 'see' them shake hands. I don't see a purpose to introducing this character in a flashback. Unless, it is to throw him in there quickly, so when it is revealed(if it is ever revealed), it is a character that has been on the show and he was forgotten about.
