The point was for Xehanort to become a God he could care less about the rest of them.Wait, wait, wait, wait.
If the Nobodies already had hearts and Xemnas' real goal wasn't to become "complete"... Then, what's with the KH2 artificial Kingdom Hearts? What's the point of that? 0_o
They are already complete, but I guess "brainwashed" to believe otherwise.