Can they find a coach who believes in the proud traditions and who is capable of developing a new era? Will Rondo participate, or will he be the next to go? There are hard questions left for the Celtics to answer, but the most painful week is behind them. They and their fans now have some sense of what it was like to be on the wrong side of that trade for Garnett in 2007. The celebration in Brooklyn is happening at the expense of the Celtics now.