I think it could have been Xion during Roxas' awakening as well. It's not the mind that the awakening takes place in, but the heart (which can be seen in BBS as well in the intro to Ventus' story as only half of his heart is filled). But if it is true that Xion was absorbed into the heart of Roxas at the end of Days, then it could well be a memory of Xion in his heart.
Okay, I was just confused. I also found it weird that no heartless show up in birth by sleep other than in the flashback. If they existed, why aren't they alongside the Unversed?
In ventus's story, a flashback is shown with ventus training under Master Xehanort. What I don't understand is, ventus is being attacked by heartless. The heartless did not exist until Master Xehanort took over Terra's body and began research with Ansem. Is it just something I missed?
