Though I wonder why Gabe becomes a vampire and not a lycan, or a necromancer even. Or maybe, as Dracula, he is all of them? Was he bitten by a vampire? In the Carmilla battle I watched (as I mentioned before, I did not play the game) he is bitten by Carmilla, but I don't think that was scripted. It just looked like Carmillas grabbing move. Damn it's hard to know these things when you haven't actually played the game yourself, lol!
Also, what do you think became of the Combat Cross/Vampire Killer? Does Gabe still have it even after he becomes Dracula? You don't see it in the ending. It would make sense if the Vampire Killer is the only weapon that can defeat Dracula, since it's the weapon that kind of made Gabriel into Drac. If he had used it to kill Marie and Claudia too, that theory would've been even more appropriate. The weapon would be OMG CURSED and Dracula would fear it cause it's stained with his.. dunno... sins.
But that unfortunately didn't happen.