Crisis, you blew my mind. Bravo.
After your thorough, citated and just amazing response, I definitely see it as the way you and TheouAegis described. Just amazing.
Inccubus, I think one of the reasons I fancied Vlad cursing God and becoming Dracula is based on the notion of unfathomable loss. I take a lot of that interpretation with Coppula's Dracula and that it was his anger and sorrow was just so great he became one beyond God's and death's domain. So I definitely wasn't discounting that. And that's more to what I was referring to when I say I was a little disappointed to hear Dracula's origin is based more on a stone versus the culmination of his own personal anguish and sorrow (though it's still intrinsically tied together, so that's still awesome).
I never realized how much the accompanying text from the previous games really set up LoI to be a good birthplace to set into motion the creation of Dracula. Bravo to Iga for making that work yet keeping with his guns that Trevor dealt with Dracula first. Definitely a man who understood Castlevania's universe and how to work within it while adding his own flair.
Like I said in the disclaimer earlier, I haven't beaten LoI yet and these are my impressions from the information I've read here at the Dungeon, so thanks for being gentle.

Though maybe I'll go and boot it up and try playing it some more tonight...