I'll look into Anub'Arak and the Twin Val'kyr. With those encounters, do you actually kill the bosses, or does it end with an emote or something?
As for the faction champions, this is a known bug, and I have the same question for that. Is there an emote or something that would trigger when the bosses die.
As for not being able to award points for it, just make sure you initate a manual snapshot for them (/grss Anub or /grss TWin Valkyr or /grss Champions).