The Boston Celtics changed in almost every single way imaginable after the 2012-13 season. Long-time Boston legends Paul Pierce and Kevin Garnett were shipped off to the Brooklyn Nets in the now-infamous trade that became the building block of the Celtics’ rebuild.
What turned out to be the biggest change (given Pierce lasted one season in Brooklyn and Garnett a season and a half) was the change at the head coaching position. Doc Rivers was traded to the Los Angeles Clippers that summer in a rare cap maneuver that allowed the Boston Celtics to gain even more draft capital.