Thematically it completely makes sense--if Trevor gives up part of himself after failing to beat Dracula to become something more powerful. To lose half his humanity as a sacrifice. And it might account for why Gabriel seems to be withering away in sadness at the end of the first game--that his son made himself a monster to beat his father, then Gabriel is forced to kill him (this is all speculation).
I'm really excited to see where all this goes.
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I think it's a logical interpretation. Its not "dumb" at all. You may not like it, but it isn't dumb. I mean do we really need like 10 Belmont's that are practically interchangeable? Im glad to see something that separates them and makes them unique.
As far as Alucard goes, it would be weird for Drac to have another woman in his life. It would lessen his whole cause really. Marie is such a driving force, and Alucard needs to be Drac's son, so yeah. Its the best way to get from A to C in this case.