It makes me wonder how important could Astarion be?
Probably more than we think. There is one scene that he is trying to figure out the meaning of scars on his back. And it's a confirmation from Astarian that Cazador carves them on his back. And turns out it's a part of an infernal pact with the devil. Consider we actually have dealt with things from Nine Hell more than once in Act 1.
Exactly, there is more to Astarion than meets the eye.
