In 2019, that mistake was Josh Rosen. To this day, no one really knows what Josh Rosen will or could be in the NFL. He was hindered by a poor offensive line 2018 with the Cardinals and hasn’t really been given a shot with the Dolphins outside of two and a half games.
The mistake that Miami made wasn’t trading for Josh Rosen, the mistake they made was trading for Rosen and sitting him most of the season. The Dolphins spent way too much for a player that rides the bench and really has little future if the Dolphins draft a quarterback in April’s draft.