Even if it was just the sequel, sequels are designed in a way so you can play them without having played the first part and won't miss out more than a few references. Considering how many Disney games appeared on the Gamecube, maybe Disney applied some pressure?
That Guilty Wing is either a joke or a special feature, I doubt it's a real game. Even if, it'd fit in with the orange blob on the right (something about PS2, PC and online, probably FF11). If you ask me, that "Guilty Wing" is probably a comic they made using FF11 and print only in their own magazine (therefore "only for"). Or maybe they're making an online cometition or something.