WALTHAM, Mass. — Paul Pierce pulled a Kobe Bryant on Monday, announcing this upcoming season will be his last. But his former boss believes it could be more of a Michael Jordan situation. Celtics president of basketball operations Danny Ainge was asked Monday at the team’s media day what he thought of Pierce stepping away after the 2016-17 campaign, but he didn’t sound too sure that’d actually be the case. “First of all, I think Paul can play for a few more years,” Ainge said. “I’ll believe it when I see it.” So why does Ainge, who won an NBA title with Pierce in 2008 and spent roughly a decade with the 10-time All-Star,