I actually think sole survivor needs to go, in a sense its similar to shake it off in that it is very situational and not beneficial to single boss raids and usually even during adds... It has plenty of uses soloing and/or dungeon content but why make it function this way when you could give it uses inside raid environments like they did with shake it off. This is actually a perfect chance to change sole survivor into an actual tanky cooldown which drk could really use for some more self sustain. I would say drk needs an HP grab the most even though another mitigation cooldown wouldn't hurt... technically sole survivor was an hp grab anyway albeit a very clunky one.