The Biggest Harry Potter Easter Eggs Hidden in Fantastic Beasts: The Crimes of Grindelwald

In the same scene during Dumbledore's Defense Against the Dark Arts class, the camera briefly settles on a young boy dressed in Slytherin's green robes. It wouldn't be notable, except for the fact that the boy has bright, white-blonde hair, just like everyone in the Malfoy family. The timing is too early for it to be young Lucius, but maybe it's Draco's grandfather?