December 19, 20178 yr Haha, this is great! I think you could interpret the statement as "there can't be two masters of the same keyblade". Surprisingly, in japanese it's nothing about masters, but about 勇者(yuusha) which roughly translates to 'brave man' or 'hero'. So really, it's a translation thing.
December 20, 20178 yr Xehanort: Now let's shall have a Keyblade War between 7 lights and 13 darknesses.
Are you sure about that, riku.
(Brought to you by youtube)