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I agree with the removal. Voldemort is the one who pulls the strings in all books on the villainous side, just as Dumbledore is the Big Good for pulling the strings on the heroic side. A Greater-Scope Villain has to be an even greater mastermind, remotely carrying over their plans via the actions of the Big Bad. Salazar sure as hell doesn't fit, and the example naming him clearly violates Examples Are Not Arguable. So does the "if you count the Horcruxes as different characters" one. Snape definitely isn't even a Big Bad, as he was Good All Along; and Pettigrew is The Dragon.
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How well does it match the trope?