Jaylen Brown and Derrick White are stars in the NBA. Payton Pritchard and Anfernee Simons can pop off on occasion. There is no lack of talent at the top, but the fall off from the stars to the rest of the roster is not gradual; it's steep. And that inability to rely on over half the roster each night may hurt the Celtics more than anything else this season.
That's not to imply that the role players on this team can't contribute. Neemias Queta has shown some great strides in an expanded role and Sam Hauser remains a dead-eye shooter.