During the first scene between Darkness and Maleficent, Darkness stated that the Master of Masters chose each of the worlds the Keyblade wielders play through because each of them is the resident world of one of the Princesses of Heart, with the purposeful exception of Radiant Garden/Destiny Islands being Kairi's home world. But if that is the reason for the roster of worlds that the Keyblade wielders travel to, it begs the question: Why is Olympus Coliseum there? There aren't any Princesses of Heart from that world. What purpose does it serve being there (not counting the PvP battles that they set up in the story, because those only gave the world a purpose after the fact of its inclusion). Anyone got any ideas?