Man, Mary the hunter. What if Mary hadn't died? The djinn's version of that wish coming true might have been made only with information pulled from Dean's mind. Imagine: Mary the hunter remembers what Dean said or doesn't wake up in the first place and never interrupts Azazel, so she gets to live. Then Sammy starts developing powers somewhere along the way - he's always been her special baby anyway - and eventually she recognizes that they're powers and not just a little boy's imagination. And then she has to tell her beloved John, who she loves because he's so normal and good even though he was in the war, the truth about the world. Would that John become a hunter with her to protect their children or would he freak out and disbelieve?