Just because something has a larger scale it does not mean it has things that are stronger, it simply does not work that way.
More often than not, it does actually.

The strongest person in my local gym is most likely not going to be stronger than the strongest person in an entire country.

The ONLY enemies those worlds have are Heartless and Nobodies, which honestly, thats where you stop, there is NOTHING else but Heartless and Nobodies.
I'm really not understanding what your point is. Heartless and Nobodies are quite strong as well, you know.
By the way this is really fun debating with you :P
Most people on this site would probably disagree.