On the Mance/Dayne thing -- Mance was not just a rise to power beyond the wall type of thing. He was a night's watchman for most of his life. Thorne(who is at the wall for fighting on the side of the Targs) would definitely have known/recognized Arthur Dayne or Rhaegar Targaryen. If Mance was either -- he wouldn't have hated them so much or fought them so harshly -- he would have still been loyal to them most likely.