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There is context for that though. Kingdom Hearts was corrupted by darkness because Xehanort opened it. The same thing happened during the final boss fight. While Sora was in Scala ad Caelum, the guardians of light kept KH at bay by keeping it shut. Sora rendered it "inert" by closing Kingdom Hearts, preventing it from releasing light and darkness to destroy the World. The End doesn't attack by opening its keyhole so idk what Sora sealing it is gonna doSame way true KH became inert after being sealed.