User blog comment:Kajune/Does Dean require demon blood for Michael to possess him?/@comment-27593090-20151230201510/@comment-26982641-20151230222319

Sam wouldn't explode anyways. He is the vessel. Only thing I know is Cas gave wrong information many times in the show. A simple example, he told Dean that when Michael's in and out, you'll be worse than Raph's vessel.