You couldn’t dream up a career like that of N.F.L. star Patrick Mahomes. In less than a decade, the Kansas City Chiefs quarterback has forced the -watching world to recalibrate its expectations for young talent. Earlier this year, the team extended his contract at a value of just over $500 million—the highest deal in the sport’s history.
Mahomes, who initially planned to follow in his father’s footsteps as a professional baseball player, ended up taking over as Kansas…

