What if you attach the alligator body to a human, then kill/destroy the original alligators head, does the body die aswell? or maybe then control over it transfers to the human that's currently attached to it?

Or maybe Law (or the Clown dude?) can just control all of this as he pleases?

This is some magical shit going on right here lol, kinda hard to figure out how this all works without the show actually explaining it.