1st of all, 200th POST WHOO! 2nd: Well, Xemnas visited Aqua's armor often, calling it "friend," and Xigbar said one time he heard a voice talking back. What if somehow, the armor transformed into Aqua, and the chamber of repose transformed into the Land Of Departure, kinda like a hologram of sorts. Aqua's heart is brought from the RoD into her armor, and her armor appears to be her body, Xemnas, sabers drawn, begins to fight her, and Aqua fights back. One of them wins, Aqua's heart returns to her real body in RoD, Xemnas leaves the Chamber of Repose, the armor and keyblade goes back to normal, as does the Chamber of repose. And they can do this repeatedly, like the Sephiroth battle in KH:1, or the Orginization member battles in KH:2 FM+, now I know this is a little far fetched, and unlikely, but in KH Anything's possible.