I have to wonder who he saw when he unhooded her that first time, but it was probably Kairi. That is how he saw her later when they met on the Islands, and then in Beast's Castle before she went to meet Namine.
I saw it coming T_T damn you Squenix.
There's fuel for a whole bunch of Ven related fires because Xigbar saw Xion as Ven I wonder who Xemnas saw her as. Better read up on those unlockables and then the Ultimania.
Apparently, it was written in the first game's ultimania, going by Audo. It makes sense, but until an official source didn't come out and say it, I liked to think there were other reasonable possibilities, like Ven or even the Keyblade or something of that source.
Thanks for the rep, regardless. 1 point away from another box XD;