Chip Kelly (Philadelphia Eagles)
Looking back at things, it’s hard to understand how things went wrong is such a hurry for Chip Kelly. When he stepped in for Andy Reid in 2012, he had a roster in place that had good players in place. Young players too. Nick Foles the future Super Bowl MVP at QB. LeSean McCoy at running back in his prime. All-Pros Jason Peters and Evan Mathis on the offensive line with future All-Pro Lane Johnson soon joining them.
On defense, Fletch Cox was in place and Malcolm Jenkins would join him a year later. That core was plenty good enough to make a deep playoff run if they’d been handled properly. However, as time went on it became clear that Kelly did not have the capability of handling the personalities on that roster. He soon began to remove them in favor of players who were less of a “distraction.” Combine that with his power struggle with GM Howie Roseman and things well downhill fast.
After two straight 10-6 seasons, he bottomed out in 2015. Roseman overhauled the roster in 2016, hired Doug Pederson and the Eagles won the Super Bowl a year later.