I personally think it's both, a user posted on here at one point he is sealed and he died from A.
He got sealed for the most point of what we have seen, from the brothers fight. Then we also seen a white snake burn from the fire.
If I had to make a guess if he was to come back to the world of Naruto in one piece, HE WOULDN"T, a half version of him self, MAYBE, then combine with kabuto, IFY, if kishi wants to get rid of him.
Because think about he showed us that for a hint/reason, Oro will return in some shape way or form wether you like it or not.
Me I just waiting to see how he is going to make it happen.