at first for me, it doenst make any sense, but since there are a a lot of questionable part in KH 2 like Xehanort ansem's apprentice, as well in the final mix where a hooded xemnas makes a scene where he enters the chamber of repose as i recall, he was reminiscing " it has been a long time my friend" to Aqua's armor. and that special secret boss where you get to fight terra's lingering spirit. by that it will give meaning to those who are riddled by this mysteries. we just got to bear with the whole 2.5 part since RE;Coded is also part of it which happened after ther KH2, that's why they use 2.5.