Usually, head coaches like stability with their assistants. If the head coach stays for another season, their assistants are also retained. However, the Detroit Pistons coaching staff is pretty much all new, except for the head coach, Dwane Casey.
It is no secret that Pistons general manager Troy Weaver is pleased with the job that Dwane Casey has done as head coach. He even gave him a one-year contract extension at the end of last year.
Normally, when a new general manager comes in, they like to pick their own coach.