Bone Carver and his Siblings....Asteri?

So, in my ride to work this morning, I had ACOWAR playing and the scene with the Bone Carver meeting with Cas and Feyre happened. Maybe this has been covered before and I missed it entirely, but a thought occurred to me - could the Bone Carver and his siblings be Asteri that had their power diminished? There are allusions that the asteri once numbered more, and their particular beef with Prythian could be more than just them throwing them out of thier world. Maybe they took down some folk in the meantime, and in addition to that trapped Asteri in the glass coffin under the Dusk Court, those three who are trapped in their respective places might also be Asteri?

It was just a sort of idle thought this morning, but I wanted to share it in case I'm on to something or if the other folks here know more to refute/confirm it.