These mortal youngins and their penchant for time travel. He's never going to understand.

That entire process strikes him as wholly inefficient. No wonder their numbers are so few, though he doesn't doubt that something else is also responsible for diminishing said numbers in the first place. Considering the circumstances from which he hails, eight or nine people still sounds rather generous. That many for so many worlds, on the other hand—that sounds worse.

"What became of the universe?" Based on context, he can guess at the meaning. After his earlier curiosity regarding the boy's demise, it seems almost silly on the surface to ask this if he doesn't account for the fact that Sora's knowledge is quite vast.