Something tells me he wouldn't be quite as deadly without the Popovich scheme. It's the same effect that Sloan had on all of those Jazz guys who would leave in free agency and massively underperform.
Apples and Oranges comparison. Dallas was one of the better teams in the NBA down the stretch so the Spurs got hit with a team that was at peak efficiency who had been playing in do or die games for weeks just to make the playoffs.