There was always likely to be plenty of movement on the Celtics’ bench this off-season with Joe Mazzulla given his first opportunity to hand-pick his coaching staff. This was exacerbated by the almost inevitable departure of lead assistant Charles Lee, who has been handed a four-year deal as head coach of the Charlotte Hornets, replacing Steve Clifford. Lee had spent just a single season in Boston, yet he was praised for bringing energy and positivity to the camp and having accumulated vast amounts of experience with the Atlanta Hawks and the Milwaukee Bucks, he deserves his chance to prove himself as a number one.