Jameis Winston found himself in a difficult situation two years ago. Despite being the number one pick in 2015, starting 70 games in five seasons with the Buccaneers, and leading the NFL in passing yards in 2019, no franchise wanted Winston to start for them when he became a free agent in 2020. If any such offers did exist, then at best Winston would enter a competition and that almost always means that the team has a weak supporting cast.
As we saw with Tom Brady choosing to replace Winston in Tampa Bay, good supporting casts means that the team is attractive to good quarterbacks.