Well, that was one way of putting it. Aqua wasn't certain what to make of Xion's Keyblade, but given that there had been four (or possibly five) active Keyblade wielders last time she'd been aware of the matter, she would agree that 'rare' was a fairly adequate description. Just because she'd grown up in an environment of Keyblade wielders didn't make the same true for everyone, after all.

She didn't speak up immediately, instead turning her attention to her share of what the Nightmares had left behind. "They are. But that doesn't mean there can't be more than one."