The Brady Factor
It’s impossible to overstate Tom Brady’s influence in Foxborough. The quarterback was a phenomenal player who assimilated perfectly into Belichick’s system. However, this also made it incredibly difficult to replace him when he finally departed as a free agent in 2020 (via Bleacher Report).

These days, people love to rewrite history and claim that Brady wasn’t that good. In the end, his numbers and longevity speak for themselves. Brady was a five-time NFL MVP and a 15-time Pro Bowler. He also led the league in passing yards four times and five times in passing touchdowns.