Bill Belichick

Rob Gronkowski was so mistake-prone early in his career that Tom Brady and I threatened to bench him.

People don't understand the process and they think that Rob Gronkowski was always great. Far from it. It was to the point where Brady and I sat him down and said, 'Rob, like we can't put you in the game. You're too undependable. You run the wrong route, you fumble the ball. You make too many mistakes. We can't play you.' Okay, what do I need to do? And then he became great where he was as dependable as any player we had.