We have seen in Skin Game that Uriel’s grace has some things in common with mantles. What would have happened if Uriel without grace had died?
Is your theory that Uriel wasn't
always Uriel? That someone else might have once held that role?
I'll allow that certainly is possible. But do you have any further theories on who or what once held that mantle? Anything from the text or WOJ to indicate that idea? I grant you it's an intriguing idea. But I don't know that I have seen anything to hint to that actually having happened, despite the fact that perhaps it could. Not trying to sound harsh here, I hope that's clear.
It's just a very unusual idea. The only thing I have found is an old post about a WOJ (that I cannot actually find) that said that Uriel might simply believe himself to be a being called Uriel who is an Archangel, not that he is. Something to do with how human belief makes that possible.