Maybe spoilers. you have been warned.
I have a post on this, if you don't play him I think I found his corpse in Orin's lair, if not the person looks exactly like him, there are also like 7 other dead people in the room, and you character only comments on him, saying she really went overboard torturing him.
I took the liberty to add spoiler tags to the relevant bit for the purposes of quoting this comment.
That does seem interesting though it doesn't really provide confirmation or answers and I think that's on purpose by Larian because the game doesn't really have a canon for anything and since they don't lock the player into playing the Dark Urge as a white dragonborn he can be just about anything so I don't think they want to render the player's choice irrelevant. The more interesting bit would be to see if that is there when the player is the Dark Urge.
If yes then that would pretty much confirm that body isn't the Dark Urge and similarities with the Dark Urge from promotional materials would be nothing more than coincidence.
