WALTHAM — It wasn’t so much a complaint as it was a statement of fact.
Brandon Bass  was asked after Monday’s practice how much of a challenge it will be for him to go from starting role to the bench and back.
“That’s life, man,” said Bass. “You wake up, you don’t know what to expect. Sometimes it’ll be like that. You’ve just got to make the best of it.”
He started the first two games this season before being swapped out to the bench for rookie Jared Sullinger Saturday night in Washington.
It’s not like Bass didn’t see this coming as Rivers informed him that the Celtics would use at least three different starting lineups this season, based on matchups.
“You know what? We have so much going on,” Bass said. “If it’s going to be my role to come off the bench, then once when get the bench chemistry down, and put the ball in the right player’s hands, then I think it will benefit us as a unit and as a team.”
“It’s expected when you have a new group with a bunch of new guys.”
Bass also gave an indication of what Doc Rivers  expects from him this season.
“For me to grow here, I have to be more active. We have a bunch of options. Doc said to me, it’s Rondo, Paul and Kevin and Jeff they’re going to go through so I have to be more active in everything on both ends of the ball.”