In the NFL, there are constant arguments over whether winning should be considered a quarterback stat (I know, it's dumb, but stay with me). I think the real question should be whether winning is a coaching stat. Coaches are the ones who set the culture, and without a strong one, you're usually going to see a lot of losing. The same can be said about the NBA, and the Spurs are showing you why.
It can be difficult to pinpoint who to praise at times when everyone is healthy, and you have a star. The franchise player's usage rate is always extremely high, so, like the quarterback, everyone wants to give them all the credit.