[q=Big D]Why would he want to get rid of it?[/q]

I thought he changed his name because (SPOILER)he was ashamed that he couldn't stop the Heartless.

And, yeah, the FF characters in KH were just cameos. They didn't really play a big part in the plot, so the "character development" they get is very... small. I think it was a marketing technique. That's definitely why I bought it.