Why was Snape able to use the Headmaster's office in Deathly Hallows when McGonagall would have been the rightful replacement once Dumbledore died, being Deputy Headmistress? - Quora

Severus Snape, Harry Potter Wiki

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The chapter that made us fall in love with… Professor McGonagall

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Who became the headmaster of Hogwarts after Dumbledore? - Quora

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How did Severus Snape become the headmaster of Hogwarts? How did

Why was Snape able to use the Headmaster's office in Deathly Hallows when McGonagall would have been the rightful replacement once Dumbledore died, being Deputy Headmistress? - Quora

Harry Potter's Snape Was a Better Headmaster for Hogwarts Than

How did Severus Snape become the headmaster of Hogwarts? How did

How was Hogwarts when Snape was the headmaster? - Quora

How did Severus Snape become the headmaster of Hogwarts? How did