I’m a bit late to the party and about to take a jab at the topic of the skulls inside the Promethean Knight’s helmets so don’t judge me if i’m wrong or tear the canon to shreds.
So people think that the skull of the Promethean Knights are a human skull while others say they aren’t but to those that think that it is the skull of a human what if the Prometheans ARE HUMAN I can’t think of any other reason to why a skull that resembles that of a human’s would be encased inside of the helmet.