Unpopular opinion: I’m not arguing against Mahomes being an awesome QB, on the path to one of the best ever.
But, the Chiefs have one of the best defenses, great coordinators, and one of the best head coaches and tight ends ever. They also rarely play a playoff game away from Arrowhead.
These are advantages that Allen, Burrow, Jackson, etc don’t come close to having.
Edit: oh and two pro bowlers on the offensive line