Well if we assume my death theory stated earlier or Sam's, where when
you die you/your soul goes onto another place but isn't gone and we
assume that vampires are soulless, this could give you some fun
effects. I would agree that the only way to be brought back is as
human since vampires have no soul to be pulled back into this world.
Vampire is merely a state of the body and has nothing to do with the
person who once inhabited it. An interesting though is what if you
have a guy named Bob and Bob is made into a vampire so his soul
departs. Now say Aura decides it's time for Bob to come back or
somebody resurrects Bob's soul. Could you not have Bob and vampire Bob
walking around at the same time? Maybe this makes sense or maybe I
just need sleep.