Kingdom Hearts II A few questions..

I was wondering about a few things and figured I'd ask here.. =]

Why is Kingdom Hearts filled with darkness? Should it not be filled with hearts? The hearts being light, since the darkness in them becomes a heartless.. Unless the darkness in a heart becomes a heartless IN kingdom hearts?

Does a heartless have any light inside of it? "Even in the deepest darkness, there is light." Does this apply to heartless? It should, since they ARE heartless from a heart!

When a person (Heart, body, soul) has his heart taken.. His heart separates from the darkness inside of it and they go up to Kingdom Hearts... right? Well the body and soul become a nobody.. If a nobody dies, the soul (Probably eternal?) becomes some being, and the body.. passes away? Or does it go somewhere? Or does it become a being of its own? Maybe there's a separate "Kingdom Hearts" for bodies..?

That's all for now.. I know for some questions the answer is unknown, so if you know anything about it, try to give the most realistic answer possible =] thanks!

If you can't answer.. at least discuss..? Please. =]