It's becoming more obvious too me ass I look back at some past episodes that involve Robert Kirkland
My theroy is that he could possibly be PJ brother who had plastic surgery, where no one cam reconize him as you seem him question multiple times in his scenes. I remember a scene in which Kirkland and Lisbon are having coffee and she asked where he grew up with him answering "we moved around a lot for dads work, then it was mom I like to say I grew up in America. " this strikes a cord with me cause it resembles PJ past so I feel that theyAre somehow connected, and it's too fool Lisbon which might be a red John accomplice. Just my opinion big fan of show! Thanks