The Celtics’ decision to bring back Horford helped them get off of one of the worst contracts in the NBA in Kemba Walker. The team needed the financial savings and gave up a first-round pick to help seal the deal for some payroll reduction. Still, Horford’s play on the court next to Tatum, Brown and Smart was always a draw for Stevens according to league sources as he pursued the move. Horford had brought the best out of those guys as a defender, facilitator and floor spacer during his first stint in boston. His return now has helped that trio along with Rob Williams turn into the most dominant five-man unit in the NBA. That group is opening the door towards the Celtics contending a bit faster than anyone around the league could have imagined with this core with this 22-6 dominant stretch.