That possession was a great example of the problem.  A nice drive and kick and then a second pass leading to an open three point shot.
That's a nice possession by any measure.  The problem is that the Celts don't have many good shooters, so that open shot was taken by Crowder, a mediocre three point shooter.
If that's Demarre Carroll or Harrison Barnes or whoever taking that shot, that plays yields points more often than not.