Random crazy idea that I haven't pout much thought into:
Suppose in the reboot, they still made Gabe have his fall from grace, become evil, turn into the king of vampires and all that, but NOT be Dracula.
Have Gabriel dismiss "Dracula" as some old folk legend they use to scare children early on in the game. Later at some point, he saves some old shriveled looking man that's been held captive or bricked behind a wall or whatever. Maybe you could even have him strapped down and brutally tortured for ages with some character mentioning how nothing they do can actually kill the guy.
The guy helps Gabriel out, gives him some info, powerful weapon, or something along those lines and during the ending sequence after Gabriel receives his evil powers, you get the reveal that the old guy was the real Dracula, and now he's just biding his time, waiting for a chance to claim the title and power he feels is rightfully his.