How disappointing, I would have enjoyed putting the Sword of Darkness to good use and the novelty of having Oddeye wield it.
edit: Is it possible to edit Oddeye's items while in the village? If so, I can't seem to figure out how. If it's not possible and you give him an item during the battle, then you egress, is the item lost?
(i.e. He starts with a Critical Sword, and you give him the White Ring to equip. You are then forced to egress for whatever reason. Will he start the battle with his initial Critical Sword, or is your White Ring still safely in his inventory? [I'd rather not risk it if someone already knows.])