From what I understand, the scene in which Xigbar sees Xion and instead sees her as Ven instead of her usual self, is because Xigbar may have at one point seen Ven, and somehow those memories projected themselves onto Xion, allowing him to so Ven. This is what I've collected, and I'd like to know, for the sake of a theory of mine, whether or not this is true and/or more details on the subject. Thank you.