THE 2015-16 season was an epic one for Nike’s athletes. LeBron James led the Cleveland Cavaliers to basketball glory in the NBA play-offs and the Denver Broncos, quarterbacked by the Nike-shod Peyton Manning, triumphed in American football’s 50th Super Bowl. In proper football, Cristiano Ronaldo won both the UEFA Champions League (with Real Madrid) and the European championship (with Portugal). In tennis, Serena Williams secured her…