Spurs have done great thus far, but their schedule has been pretty easy. We all know eventually pop will rest guys and some games will be sacrificed. Given what happened last year, Pop will probably work harder for a 2 seed this year but he won't push guys to chase the Warriors. The Warriors are going to run away with the best record.
And I like your reason...they were a few plays away from being undefeated. Warriors were not. They made them.
<shrug> It just isn't reasonable to expect the Spurs to keep pace with them. That's OK with me. Spurs MO is likely to be lose 2 out of 3 (or even all 3 games) to the Warriors in the regular season and beat them in the playoffs.