It still won them three championships and made the Spurs one of the most dominating teams in the last decade.
Popovich admitted it. His championship teams were more focused on defense. They have changed the last couple of years focusing more on offense knowing that they have younger legs and worse defenders.
My point is the system is not proven yet due to last year's failure. Last year isn't only about their inability to defend Randolph and Gasol, but their shooters were also missing their shots (esp. Bonner) when it matters the most, forcing Manu and Parker play by themselves in offense.
But I'm not saying the system is not effective. They've been effective this year, the only question is, will it last deeper in the playoffs when they'll meet better defense than Clips/Jazz? I'm leaning on they'll still win, but still have doubts.
darkie, as I've said, there are two Popovich systems: the champiosnhip teams and this current team. Both plays in contrast; the first one has mighty defense and slow offense (focused on Duncan), while the current team has average defense and free-flowing offense.
CK, proving something is about having the end result but you need to go there step by step and systematically. You know your math. Sports teams are winning for many reasons but not luck. Same as losing.