The Celtics were an excellent squad last season, came close to reaching the NBA Finals, and should have a healthy Gordon Hayward and Kyrie Irving this season. They kept all their key players, which is huge. Here’s reporting what center Aron Baynes said on this topic:

Baynes indicated during a charity appearance Wednesday that the lack of roster turnover this summer could play an important role for the Celtics.

“Last year at this time we were learning peoples’ names; this year we can get into the finer points of the systems that we’re learning,” Baynes said, via “We’ve still got a bit to learn and a way to go in incorporating the healthy guys back into it, but it’s definitely exciting that we’re starting at this base level compared to where we were last season.”

Full article