That seems to be a popular comment. With how complicated it is to import new models and create new battle events in the game I'm just impressed with how well it came out. The dialogue with Barret may work better just coming from Cloud since it's just him talking to Donald, but otherwise there really isn't much room for improvement.
Besides, Riku really wouldn't fight with Sora, let alone Goofy and Donald. Maybe King Mickey, but otherwise probably by himself which wouldn't look as cool for a demo of something like this. Unless he transforms into his Ansem form after losing a certain amount of HP and has different moves, that would be pretty awesome.
