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          Will Celtics surpass Cavs with Horford?

          Scott Cunningham/NBAE/Getty Images
          • Kevin Pelton, ESPN Senior WriterJul 2, 2016, 08:00 PM ET
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            • Co-author, Pro Basketball Prospectus series
            • Formerly a consultant with the Indiana Pacers
            • Developed WARP rating and SCHOENE system
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          The Boston Celtics finally landed the kind of star they've been trying to acquire: Al Horford. So, after surprising the league by winning 48 games last season, how good is Boston now?