The Boston Celtics have one of the strongest starting fives in the NBA, but the bench might be where they can get their biggest advantage. They have an opportunity to have a second unit that no one else in the league can compete with, and they have a lot of different options.
There is a lot of uncertainty with Marcus Smart, but they will clearly be better with him on their second unit. Having of the best defenders in the NBA, with versatility that allows him to guard all five position, coming off the bench, is a luxury that no one else in the NBA can compete with.