That's a different direction. That's a large group of different games coming together in a fighting genre, in the setting of a young person's imagination while playing with toys. It's not canon.
Kingdom Hearts is part of Final Fantasy canon. I am not claiming Cloud and Mickey are the same thing, thus your argument does not fit. I'm claiming they were both in a game that is part of a larger series of games.
A lot of Kingdom Hearts gameplay aspects come directly from the Final Fantasy series (characters, weapons, items, spells, etc). You can argue all you want, but it will not change the facts.
The easiest way to understand this is to relate to basics. Final Fantasy is an apple. Disney is a grape. You are saying Kingdom Hearts is an orange, when in reality it is a grapple.
(GrappleFruit Website)