I'm calling it right now btw, Terra=Xehanort=/=Master Xehanort.
I second that. It seems like when a Nobody and Heartless are made, those entities have no complete memory and I remember Ansem saying that when he found "Xehanort" that the name was all he could remember. There's a good chance that in BbS something happens to Terra that gives him amnesia, he winds up in Ansem's world and all he remembered was the name of the former Keyblade Master. From there he decides to [tornado fang] around with darkness and creates the Nobodies of the Organization. His heartless ends up getting a second wave of amnesia or whatever and adopts the name Ansem, while the Nobody does the X Anagram with Ansem to actually hide his name or something, I don't remember why.
Here's an interesting question: we already know that when someone's heart is taken, the body just disappears and a Heartless is created, and a Nobody is the body of the person if they had a strong will, and those with an extremely strong will have their entire body stay the same, but hardly any of their original memories and whatnot. Here's the thing: Xehanort's Heartless retained the body as well (to a degree), but was just like any other Heartless, and the Nobody was vaguely similar. What are the Heartless forms of the other Organization members? I mean, that couldn't be the ONLY exception to the rule, that the Heartless just turn into whatever beast regularly, right? As for Sora, since his will was strong enough to create a Nobody with a form, wouldn't that have also mean that he should have turned into a different Heartless rather than just a simple Shadow?
I know I'm reading too much into it, but even in the first game, not taking into account the Nobodies existing yet, shouldn't Sora have had a form closer to his original self if Xehanort was able to do the same? Did I just miss something or was it a case of the creator not thinking that deeply or into it, ala Miyamoto and Zelda?