This is a very interesting NFL topic. Most rookie quarterbacks can benefit from riding the bench behind a well-established quarterback before taking over as the starter. For example, Jordan Love backed up Aaron Rodgers from 2020-2022 before taking over as the Packers QB1 in 2023. Sometimes, NFL quarterbacks bounced around multiple teams before reviving their careers.
Baker Mayfield: Browns 2018-2021, Panthers/Rams in 2022, Buccaneers 2023-present. Since joining the Buccaneers, his career appears to be rebounding.
Sam Darnold: Jets, 2018-2020, Panthers 2021-2022, 49ers 2023, and Vikings 2024-present. Since joining the Vikings, his career appears to be rebounding.
Geno Smith: Jets, 2013-2016, Giants 2017, Chargers 2018, Seahawks 2019-present. Since taking over as the Seahakws QB1 in 2022, his career appears to be rebounding. Smith made the Pro Bowl and won Comeback Player of the Year in 2022.