data-mm-id=”_pgtntsjbf”>Everyone expected the Boston Celtics to be a fine team this season. Through the first month and change of the NBA season, they're better than fine. In fact, they're one of the best teams in the league by both record and statistical metrics. While they dropped a close one to the Los Angeles Clippers last night to fall behind the Los Angeles Lakers for the best record in the league, their performance over the opening 14 games of the season seems sustainable. The 2019-20 Celtics are no fluke. The most impressive, and surprising, part of this early surge has been the team's defense. The biggest loss this offseason wasn't Kyrie Irving (going from him to Kemba Walker is as lateral a move as you're going to get when it comes to star point guard…