What do you think the chance of Xigbar (character would actually be called Braig) appearing in BBS? Xigbar said to Sora that there was other keyblade wielders. I don't know if its been confirmed or not, but I'm assuming Terra is Xehanort. Being that Xehanort becomes an apprentice of AtW, it's possible that in the end of the game the other 5 apprentices are present. But Xigbar in particular. For example: It may explain how he knew about other keyblade wielders(Possibly fight Terra, Ven, or Aqua), it could also explain why he is covered in scars and is missing an eye. Being 10 years younger his hair would probably be shorter and not grey. Perhaps you meet him at the coliseum entered in a tournament, who knows. Its most likely the rest of the apprentices would be present if Braig was. If this theory is true, I hope that it will show how the 6 apprentices studied with AtW then turned on him, and then how they became Heartless and Nobodies, and possibly show how they formed Organization XIII. In one of the Secret Ansem Reports, AtW says that Even (Vexen) was interested in Xehanorts memories, so they have some stuff to work with, but I guess we'll just have to wait. What do you think?