If the imagination/demiurge theory is real, maybe the Third Legendary gave Clavell the Academy. After all, Sada/Turo gets a time machine and Heath's Cyclizar OCs become legendaries.

It is way too convenient that all the staff leave after a bullying conspiracy, allowing Clavell to magically step into directorship and is able to uncover said conspiracy with the help of his best student yet while going undercover.