1. Andrew Luck
It looked like Luck was Peyton Manning’s perfect successor. The Indianapolis Colts had another brilliant franchise quarterback. On the face of it, he had an excellent career. A four-time Pro Bowler, he also won the NFL Comeback Player of the Year award. Meanwhile, the Colts won the AFC twice with him at the helm. However, he stunned the world when he retired in his prime at the age of 29.
Luck cited the number of hits he received while playing for the franchise. He absorbed so much trauma that his body couldn’t take it anymore. In short, the Colts wasted a golden opportunity to build a Super Bowl contender around him. They also failed their star because they didn’t protect him properly. While he overcame their offensive shortcomings at various points, the sacks became too much.