Josh Allen
Amazingly, Allen evolved into one of the NFL’s premier quarterbacks after his inconsistent start in Buffalo thanks at least in part to a coach mentioned previously on this list, Brian Daboll. The quarterback impressed for the Wyoming Cowboys before the Bills made him a first-round draft pick. However, he failed to set the world on fire and many fans wrote him off before he turned his career around (via ESPN).

Then it felt like he came out of nowhere in 2020 and he fell narrowly short of winning the MVP Award. Everybody realized that he was the Bills’ best quarterback since Jim Kelly. His duels with Patrick Mahomes became the stuff of legend and he personified an exciting Buffalo team. It’s one of the great turnarounds in NFL history because nobody saw it coming.