In addition to having the number three overall pick in the draft, the Boston Celtics have two other mid to late first round picks, and an unprecedented 5 second round draft picks. Stephen Zimmerman may still be too young to immediately have a crucial role on the team, but his ability as a two way center makes him a great option for the Celtics with one of their later picks.
The Celtics know that they still have a lot of rebuilding to do with their front court and Zimmerman can offer them something that is otherwise lacking on their roster, while being a phenomenal fit for Brad Stevens on both ends.