Who is always around?
Who has inside knowledge?
Who likes women with red hair?
Who showed PJ what he lost when he married?
Who showed PJ what he has lost when he got a baby?
Who is acting a little dump that nobody get suspicious?
Who is leaving the show at midseason without any know reason?
Who would shock the audience the most if it turns out that he is red john?
The serious face of him in 6x07 promo was the last part of the puzzle for me. Never saw him so serious!