Again careful, spoilers^^
So we know that the master of masters was the one who wrote the book of prophecies. He knew whats going to happen because he had "the gazing eye" or well no name whatever. So he wanted Luxu to pass down Xehaborts Keyblade... or well the masters keyblade, which has the eye in it. It seems that Luxu succeded, cause the master was indeed able to see into the future. But then here is my question. If the Xehanorts keyblade is passed down time and time again to a new apprentice who gives it his apprentice, then why does the book of Prophecies has an end? Shouldn't it technically never end? Does that mean we will defeat xehanort and destroy the keyblade or something?
Did i misunderstand something or is the master of masters just too lazy to keep on writing this book?