Because even on Buffy Dracula is kinda his own thing. He obeys all of the rules of his vampireness and not the Buffyverse ones. Therefor because the blood exchange isn't necessarily a carried over thing it doesn't work with Dracula.
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The cast of Caleb Does Art - 2006 includes: Caleb Coppock as
Caleb
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Caleb Wilkerson's birth name is Caleb A Wilkerson.