Record Passer Rating
The legendary Bart Starr retired in 1972 but held records for decades. He had the highest postseason passer rating in history until Mahomes entered the picture. Starr’s rating was 104.8 but Mahomes shattered this with a high of 106.6. Tom Brady’s overall postseason passer rating was just 89.8 but he has a massive sample size.

Mahomes also broke the regular season career passer rating when he went 108.7. This took him to heights that nobody imagined and showed the world how good he could be. Perhaps it’s inaccurate to say that Mahomes will be better than Brady. He already is but he doesn’t have the longevity or medals to support it (via The Sports Rush).