True, but magic potential isn't limited to 'genetics'. Bianca learned from Mavra, after all, and they are different types of monsters. I was trying to refer to which templates are tied to your bloodline more directly, like the WC Virgin and Changeling, because these offer you the choice between two halves: the human and the supernatural one. The RC Infected doesn't have this choice, he/she already has one leg in the supernatural world, but is forever and fundamentally changed, which leads me to believe that it would affect your 'genetic' make-up too.
Maybe if you turn it around a bit, it is more clear: you can also be a wolf-were, an animal shifting into a human. Mechanically no different at all, but would you allow one of those to become a RC Infected?