It's funny really....I just read an interveiw that stated that KH has to have them in it since it is revolved around them.
Think about it. Is it KH with them? Yes, without them? No. What would happen to Donald and Goofy? You jsut can't take them out of it and barley show them at all... and if you bring in a new guy to fight with them or interact with them in anyway. They'd have to explain what happened to Riku, Kairi, Sora and everyone else. If you haven't seen the ending fo the game then its pointless to argue about it. We all see the bottle with the King Mickey seal.
Of course hes asking for some sort of help or something of the same area. Other wise they wouln't have shown it, it wouldn't be important enough to show it unless it meant something was going to happen. It would be pointless.