Did someone say thousands?

I mean there's a KEYBLADE graveyard with thousands of blades, but that doesn't denote thousands of wielders. Keyblade forms are created from a wielders heart. Apparently, most of Sora's keyblades end up copying forms taken by earlier wielders due to Ventus's memories of his days as a wielder, Terra, and Aqua. Notice that Sora never uses any of the keyblade forms availalbe in Days (save ones he already knew of) because when Roxas re-merged with him, Roxas's memories (including Xion and Namine) were sent to oblivion), Sora only left with a lingering impression of familiarness toward Twilight Town.