I just had an idea come into my head just now, I got this after watching the Lingering Senitment battle, I know this whole fight was non-canon and blah blah, my idea was, if the keyblade that Sora uses, what if for some reason its the same one that Xehanort uses in BBS? Maybe thats why the Lingering Sentiment 'remembered' Xehanort before fighting Sora? Just a question nothing more, not sure if anyone brought up the idea before.