Cleveland is winning by 12 points per game, LA and Boston are winning by around 9-10 points per game, San Antonio is winning by less than 4 points per game.
So it is fair to say that the Spurs do not get as much out of their offensive and defensive possessions as these teams. And you can't say that the early season injuries created this large of a gap.
I didn't mean to get off on a tangent, all I said is that the Spurs are not as good as their record (due to the abundance of close calls that they EASILY could've lost) and Mayo got hacked on his last drive.