Offensive rebounding? They're not a crashing team, nor are they the most athletic either.
How about their schedules?
Spurs = Lakers -> Warriors -> Memphis
Indiana = Atlanta -> Knicks -> Heat
The Spurs dominated in all of their series with the exception of a small blemish in the warriors game due to a red-hot Steph Curry.
Indiana has been in a dog fight in each of their series with the has-been's of Atlanta, Carmelo doing his be LeBron rendition and then got an edge with the Heat because they literally have no inside presence other than "The Birdman" who is a complete non-factor on and off the ball against a formidable defense.
Once again, rebounding?
Spurs are 4th in own rebounding. Not the strongest in rebounds allowed but that's attributed to the teams that they played over the course of their playoff run.
http://espn.go.com/nba/statistics/te...rt/avgRebounds
Again, the Spurs have a very balanced and different attack. Looking at rebounds is only indicative of so much.
You're a clown if you think Indiana had a shot at the Spurs.