I think the first sentence is spot on in that Iowa State's defensive system generally makes defensive rebounding more difficult. Not just with not being in great position, but we often have smaller guys tagging rolling big men, or fully switching on to them. The guards do battle when they have to box out an opposing big man, but there is also only so much they can do.
Barttorvik notes that the defensive rebounding this season is similar to last year and Otz's second year, and significantly better than his first and third years. In conference play, Iowa State is currently 5th in the Big 12 in defensive rebounding rate. (Interestingly, that 2023 team was first in conference play in defensive rebounding rate after being pretty bad in the non-conference.)
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