No, you're missing the point. Since when does nothing in KH compare with some hearts from some people? It's never stated how much power that KH can give, and we only see it giving power for Xemnas to hold his own against Sora and Riku for a while.
We never see Mickey fighting Xemnas, and Donald and Goofy gave a little help getting to him in his dimension and fighting his armored form, which Sora and Riku later beat alone while it was way stronger with attacks that could launch you out of the ship and stuff. Then they beat his final form alone. Period. They didn't barely beat him. The beat him. That's it.
And Xemnas in 3D had already fused with Kingdom Hearts, since it happens after KH. He still had his telekinesis and his warping TWTNW around.
It's not an argument because I'm not a KH character and because it's still a less than half complete artificial Kingdom Hearts.
You were basically saying to me: "But he still fused with it and you didn't. SUCK THAT!"
That wasn't even the real Kingdom Hearts, it was a false KH made from the hearts of people, and most of the hearts weren't even there anymore. And since when does fusing with something give you infinite power? He got the powerup we saw, and it was not enough to defeat Sora and Riku, who would probably get their asses whooped by King Mickey. And Sora defeats Xemnas alone in 3D, in his 14 years old body while being corrupted by darkness in a deep dream.
