Yea but the difference between that and this situation is that we actually never got to see a face behind that voice.
With Alucard and Trevor we got to see a face AND voice for each character and the 2 are kind similar if you ask me.
Just give Trevor the pale skin,white hair, and change in clothes and he looks just like Alucard if you ask me.
Of course, I honestly would MUCH prefer that it not be the case that Trevor becomes Alucard, but given the appearance and the lines about "getting a second chance to face his father" it all points to Trevor.
I had a nice sentence all planned out but my log in time expired before I could finish but I'll try to sum it up as best I can.
To be fair, Trevor and Alucard both have the same father, so it would make sense that they look alike.
I want them both to be separate characters ( I still believe they are in the very depths of my head) but if they are the same person, then something messed happened to Trevor to become a vampire. (warning, sensible theory coming up) Dracula probably defeated Trevor and brainwashed him, then Simon finds him years later as a brainwashed vampire and knocks some sense into him and thinks he can still be saved. Then he learns that while the brainwashing can be removed, he's been a vampire for too long and purifying him completely would kill him, so enter the deus ex machina and Trevor is resurrected as a dhampyr.
I could be way the hell off though.