"That's impossible! Xehanort was really old! He had gold eyes and silver hair and dark skin. It couldn't be the same person." Oh yes, they're talking about the same person. And Ventus can guess what happened, but he can't guess who it happened to. But Terra and Aqua should have defeated him…

"What did he look like? This Xehanort you knew?" He'll press him for information. He can't let this go easily. He's just hoping he was wrong, that Vanitas hadn't learned to possess people from his mentor like he thought he had.