Over the last few seasons, the Boston Celtics have invested a lot in playing small ball. They have continually gone to undersized lineup in the most important moments, and have always looked for the undersized forwards that would be able to hold their own while playing next to Al Horford.
This season, the only real traditional size the Celtics have is Aron Baynes, and he has been incredibly effective. Horford is also a seven footer, but he spends a lot more time on the perimeter and spaces the floor in a way that Baynes will never be able to, putting additional strain on the interior.