I suspected this when it became apparent that Diaw was going to be bought out and the Spurs were going to sign him and alter their rotation. Defensively, Duncan's minutes increasing, Diaw replacing Blair in the rotation, Jackson replacing Jefferson, Neal's minutes being halved, as well as no one pacing themselves and actual rest, recovery and practice time, have predictably led to defensive improvement. How significant, we'll find out in round two, particularly if the Clippers do what they're poised to do and finish off the Grizzlies.
Yes, the Jazz were the fourth highest scoring team during the regular season and seventh in offensive efficiency, but they were mostly playoff neophytes, clearly just happy to be there and lacked any semblance of outside shooting. That said, the Spurs defensive numbers in the series were outstanding (86.3 ppg, 4th fewest, .382 opp. fg %, 1st, . 200 opp. 3pt %, 1st) and they're to be commended. And while I'm not convinced they've suddenly transformed into an elite defensive outfit again, I am convinced that, combined with their league best offense, they're good enough defensively to win a championship.
But whereas the rotation changes have predictably improved the defense, they've just as predictably hurt the rebounding. The Jazz bludgeoned the Spurs on the glass. Only the Magic, who are literally playing without anything resembling a center, have a worst rebounding rate in the playoffs. Sure, the Jazz were third in rebound rate during the regular season and at times, they played three plus rebounding bigs together, but one look at the road ahead shows it's going to remain difficult in this regard. The Clippers (T-6th), Grizzlies (11th; Randolph missed 38 games), Lakers (2nd), Thunder, (5th) and Heat (T-6th) are all strong rebounding teams. Granted, the Spurs were T-6th themselves, but that was with Splitter playing more, Leonard playing more and Blair in the rotation (the only positive is Duncan is playing more). So if you're looking for a potential achilles heel of this team, look to rebounding, not defense.