If you’re not an Eagles fan, you probably know Jason Kelce best as the guy who stood in front of the Philadelphia Art Museum steps in a colorful Mummers outfit and delivered an animated speech about underdogs during the Eagles’ Super Bowl parade in February 2018. If you’re an Eagles fan, you know him as the 2011 sixth-round pick who earned the starting center job as a rookie and has served as the brain behind the team’s offense at the line of scrimmage ever since. You also can probably recite a few lines from the speech.



Kelce has come a long way since he made the University of Cincinnati football team as a walk-on linebacker. After the 2018 season, he had started all 116 games of his eight-year career, including the playoffs, and hadn’t missed a game since 2014. His streak of 73 straight regular-season starts was the longest for any active center and included four seasons in which he was named either an All-Pro or a Pro Bowler.



But when...