Sora can say that he doesn't know, but Roxas is quite sure that his other half knows a lot more than he does. He pretty much has to.

He listens carefully, nodding every now and then when Sora comes to a name he recognizes. Xemnas stole someone else's name? Well, all right, it's not like he had any qualms about taking other things that shouldn't belong to him.

The rest, though...he tries to keep up, but his eyes start to glaze over as Sora says words that Roxas understands in sentences he doesn't.

"I didn't get a lot of that," he admits after a moment of hesitation. "But if Axel's okay, that's what matters to me. Maybe we can figure out the details of the rest later."

With pictures, maybe? Visual aids? Those would be helpful.