Setanta is the son of a god. Cú Chulainn is a kid who murdered a dog. wanna guess which name people say is more important?
Doctor Oobleck is actually the lowest ranked teacher at Beacon Academy. he insists that he is not a Professor, but actually a Doctor. but a doctorate is a required step in becoming a Professor. if he is only a Doctor not a Professor then he is actually of lesser tank than every other teacher at Beacon as they are Professors, which means they must also be Doctors as that is a requirement for that position.
if Salazar Slytherin can be naturally born with the ability to communicate with snakes, why can't someone else not descended of his blood, like Harry?