12/10/12 – Teams are roughly at the 20-game mark, a natural time to take stock.  Either they’re hovering in three ranges (15-5, 10-10 or 5-15).  Seven teams, including the 14-6 Los Angeles Clippers, are all nearly interchangeable atop the rankings.  A half-dozen teams are in the 5-15 range.  The rest are somewhere in the middle on the good or bad side of the bubble.  Meanwhile the San Antonio Spurs and Washington Wizards lead the way on opposite ends of the list.  The NBA, six weeks in: