okay finally read issue #4 it was great read, but I was wondering if the guy sucked all the vampire out spike who still has a soul would that have turned him human?
I don't know why so many people have been speculating about that. If he had sucked the supernatural/demonic out of him, he would be dead, just like any other vampire Severin got his hands on. (Like the cop said: "we'd be shipping your vampire friend across the pond in a body bag". I doubt they'd actually be sending him to UK, but never mind.) They all turn human, it's just that they turn into human corpses. They are technically dead humans whose bodies are animated through supernatural means; without it, they're just dead humans.
The soul makes no difference - soul isn't what's keeping him alive, any more than it keeps a human alive. When a human body stops functioning, you die. A vampire's body doesn't function without the supernatural.