Kingdom Hearts II PoH Nobodies?

Because Naminé was born from Kairi's heart leaving Sora's body. She reunited with the heart responsible for her birth.

Additionally, it's probably not that Sora can make two Nobodies with one body, because according to the Secret Ansem Reports found in KHII Naminé doesn't have a body or a soul, the two components of a Nobody. Sora's entire body and soul went to Roxas, and very little went to Naminé.

 

exactaly, really, Sora was like a carrying device for the creation of Namine, he carried the essence of Kairi into the dark realm when he lost his heart, and both Namine and Roxas were created, but Namine was made of only what was left of Kairi in Sora, which means no body, and no soul. Roxas on the other hand, got enough of Sora's essence to gain a body and a soul.

 

im just guessing here but maybe it might be because that sora"s heart has some darkness in it (since he is not the 7 princess of light) that with that bit of darkness in his heart that it made namine and he turned into a heartless.cuz even when the 7 princess of light had there heart's taken away they did not turn into heartless cuz there hearts have 100% of light and 0% of darkness. again im just guessing here. :P