I'm not sure whether you're arguing for or against whatever you're talking about...
I'm pretty sure that one of the main reasons why there are so many SW parallels is because KH (and the FF series, to an extent...) has been helmed by Star Wars fans. Though honestly, I'd prefer it if they kept the two separate for now. Aside from the Galaxy Far, Far Away just being too big of a universe to compact neatly into a single world, for all its similarities, there are some key differences between the light/dark duality that wouldn't mix too well.
In fact, the way of the Jedi is in direct conflict with KH's main theme of friendship. For the Jedi, the kind of loyalty and devotion that people like Sora and Riku have for those they care about is a straightforward path to the Dark Side. ... And in a way, it kind of is. Luke, Anakin, Riku, Sora... at some point in all of their stories, they impulsively followed their emotions to try to save/protect those they cared about, and it ended VERY badly for all of them. ... Hm. Maybe there isn't such a big difference there after all. But in KH, unlike SW, more often than not, that sort of devotion is also shown in a positive light and doesn't always result in severed limbs and crushing defeats. In fact, it's usually cited as the main reason why the heroes can get stuff done.
Also, the dark/light duality. In the SW universe, all negative emotions contribute to the Dark Side, and the Dark Side itself has never really produced anything good. In fact, they say that the Dark Side's existence itself is the imbalance in the Force. Contrast that with Light and Darkness in KH, which casts Darkness as a much more neutral, albeit still dangerous, force. Rage and fear aren't Darkness-exclusive feelings, either, and it is possible to accept the darkness without becoming fully consumed by it.
It's two different takes on a similar concept. I wouldn't say that they would blend perfectly. :I sheesh, I got a bit carried away, didn't I?