That doesn't explain the Sanchize. The Jets team he played on made the post season his first 2 years.
Just a wild ass guess on my part, but I think it's due to the media circus that surrounds the team. That kind of distraction would ruin most young talent. It would have been especially hard for pretty boy Mark "Sanchize" to focus on improving his game. The only Jets QB who thrived in NYC was Broadway Joe. Namath knew how to play up media circus and he had the rugged good looks of cracked leather.😆 SB III, baby.