Heartless?

[Prophet]

He gave up his own in doing that as well I think.

But still how come Xenahort managed to retain a human form as a Heartless but not the Keyblade Wielder of the Light Realm?

I know obviously for game/future plot purposes but still it's interesting all the same to think about...

I guess maybe it may have something to do with Xenahort's past, the Keyblade War and the Chasers?

Maybe. As it says in the Ansem Reports, Xehanort, Roxas, Sora, Kairi, and Namine are all anomolies, throwing all science into the winds. As Ansem says, All my research amounted to nothing compared to that one boy's heart. Xehanort may have become a Heartless through special means, through a unique experiment or something, so he didn't become a regular old Heartless

 

[riku/Ansem]

That theory doesn't work, because the other five apprentices of Ansem became heartless as well, but cast off their bodies in the same way.

 

[Prophet]

That theory doesn't work, because the other five apprentices of Ansem became heartless as well, but cast off their bodies in the same way.

Hmmm... true. Maybe there was some wierd imperfection in Xehanort's experiment that allowed him to retain human form, a wierd 1 in 10000 chance or something, that the others didn't get.