Well they were out-rebounded Sunday by 25(!) and ended up winning by 17 points. There are many ways to win. Certainly limiting your opponents' possessions and increasing your own would certainly help though.
If they had someone like Vucevic or Asik, their point differential would be like 15-17 pts, instead of the current 7. The games are only marginally close because of of their opponent's offensive rebounding.