I think it's that more than matching up.
If Okur would just play the way he usually does, S.A.'s 7-footers won't be out on him, Okur would get even more looks from 3 than he is already. Also, if AK would make a defensive impact on these penetrations, then this series could change. It's just Ginobli and Parker are playing too well, they read everything, even when AK comes from their blindside, it's like they know he's there, and they kick it out to a Finley or Barry for a wide open 3.
The Spurs are playing beautiful basketball, but our rebounding will keep us with a pulse in every game. We just have to hit more shots and play better defense. Sounds simple, but it's not!
Regardless, the Spurs are putting on a clinic.