Quote Originally Posted by Tavrobel View Post
As for the Unversed, I figured that they would follow the pattern of parts that constitute a person that remain unused. But seeing as how Heartless didn't exist before KHI (according to the Ansem Reports), I supposed that the Unversed would be there to fill that void. Gotta have something to fight. I don't think that Unversed would "turn into" a Heartless or a Nobody after a certain point. If we applied an evolutionary approach, then we should have seen Unversed in KHI and KHII (very definitely KHII).
Nomura, being fairly liberal with information, has already confirmed that Unversed no longer exist by the time of Kingdom Hearts. The reason is unclear.