I'm not so sure that D'antoni doesn't believe in defense, it's simply that he places his emphasis on offense. With a team that can score like the Suns, that's not a bad regular season philosophy, but against a strong playoff team like the Spurs, it can be a fatal flaw.
The truth is, the Spurs played some great offense in both of the games in Phoenix- much better than I thought they were capable of. So much of the time, the Spurs rely on Duncan for their scoring, with the other players basically afterthoughts. But Genobli and Parker are both great finshers and passers, and Nazr Muhammmed gives them great rebounding support and easy second chance shots, not to mention a few easy looks when the other team forgets about him.
It's very hard to prepare to play defense against a team that is so dynamically offensive. Genobli doesn't even know what he's going to do before he does it. How can you defend against that!?
The Suns can win more easilly by continuing to score and make the Spurs defend them. Anytime the Suns stop scoring, the Spurs either catch up or open up a lead. This places great pressure on the Sunse to keep scoring possession after possession, against a team that makes it very hard to score consistently.
But Nash and Stoudemire are unstoppable. All they really need is for Marion and Richardson to kick it up a notch. The Spurs are lucky the Joe Johnson isn't available to help spread the floor. Jimmy Jackson is a decent player, but the Suns really need that outside shooting to fatigue the Spurs defense.
