The Keyblade weapon, despite being an early component of the game, was not Nomura's first idea for a signature weapon. "Actually," he said, "the first weapon I showed Disney was a chainsaw. It was this chainsaw-like weapon that I had a rough sketch of when I first showed my concepts to Disney."
Disney reacted pretty much like you would expect Disney executives to react to the heavy use of a chainsaw in a game about Mickey Mouse and Donald Duck: "Everyone got this scrunched-up look on their face and nobody said a word in the entire room. Dead silence. And I thought 'No, I guess this wouldn't work, huh?'"