Hi guys, My therory is that sometime in BBS Ven died and because heartless were not born then {I think} he did not get a nobody or heartless. Now that Ven is a corpse he is basically a shell, now when sora stabbed himself he created roxas but shortly after regained his body. What happened to roxas now? Well i think that he was expelled from sora's body and his soul wandered until it by chance found ven's corpse.
No Flaming, its just speculation.
No Flaming, its just speculation.