While all of the focus has been on the soap opera swirl around the Los Angeles Lakers, the NBA’s other similarly storied franchise has its own set of issues. The Boston Celtics also raised expectations by adding some key pieces in the offseason, then promptly stumbled out of the gate. But there were no death stares, insurrections, coach beheadings or panic moves. But there are some problems in Beantown. Let’s allow team leader Kevin Garnett to explain. “You can’t speed chemistry up,” Garnett said.