What happened to Potema the Wolf Queen? Trying to think of any major threats besides Harkon.

The crazy guy was the skilled of destruction who asked for advanced knowledge of necromancy which is conjuration magic i think. He was absorbed by the dwarven centurion's soul gem like the skilled of one-handed was. The centurion is the skilled now and they haven't seen any raised dead down there so the crazy guy probably isn't able to influence the centurion.

Dawnstar was attacked by a dragon and a pyro cult showed up in the area. I thought someone managed to become a dragon priest. If so, they are probably against Ulfric and convincing them to attack their areas. The Skilled of Two-Handed or Sneak are the ones unaccounted most likely to survive a dragon if they couldn't get the dragons to make them a Dragon Priest.