I also wonder why that happens. We aren't a very good rebounding team to start with but at least give it a shot
I too have been perplexed by our offensive rebounding woes so decided to do some research on ken pomeroy's site. He keeps track of several interesting statistics including offensive rebounding percentage. The past three years, as people have noted, we have been terrible at it, ranking around 300th nationally this year and last year and around 150th in Mcdermott's first year.
Now, looking back at UNI's three successful years under Mcdermott we see a similar result, they ranked over 300th nationally all three years.
So bottomline, this is likely a result of the system he runs. From a positive perspective it is possible to be successful with such weak offensive rebounding as seen by his days at UNI but whether or not that works at ISU and in the big 12 well have to wait to see.
Offensive rebounding doesn't bother me near as much as the defensive rebounding... It's one thing to get beaten on the glass if you are sending guys out trying to run, but we have no excuse to have one guy on the defensive boards...
And even more hopeful is that during McDermott's runs in the tournament with UNI they were very good at grabbing defensive rebounds ranking 6th, 12th, and 7th those 3 years.