Here is my unbirth theory that just came to me like 5 minutes ago. What if...before the heartless and nobody, when a person lost their heart both the body and the darkness stayed together and made an unbirth. I thought of this by watching the bbs trailer. The dark guy that came out of xenhort or w/e looked like a heartless, but didnt look like a creature. He looked human, like a nobodies do, but was wearing a darkness suit. MAYBE the dark guy is an unbirth and maybe sumhow at the end of bbs, terra and the crew found away to take the darkness out of them and tried to get rid of the unbirths forever, but a mistake happens and then it accidently splits them in half making a heartless and a nobody. More comments please! They interest me =D