[Galadriel55]

Perhaps so. However, even from your words, Huan didn't really kill Sauron, as Eonwe said in the beginning of the thread. Vanquished=defeated, concoured; not necessarily slain. He lost his power and his body when he was defeated, but was he really killed by Huan?
Moreover, it says in The Sil that the only reason why Sauron left his body in Huan's possession is because he couldn't escape otherwise, and he left it on free will - Huan didn't really force him to do that.
Plus, it is said that Huan must battle the mightiest of all the wolves to ever exist before he would be killed. Sauron, taking the shape of a very large wolf but not being the mightiest, could not possibly defeat Huan. So even if in reality Huan may be weaker than Sauron, in this fight Sauron didn't have a chance of winning, because of the prophecy. Yes, I know that when describing it I said "killed" and not "concoured". Sauron's goal was to kill Huan: he thought he would be able to do the prophecy. Not only defeat, but kill.

This probably makes no sense whatsoever, but these are the best arguments I can present for the case at the moment.