One thing jonesy is right about, shooting will come and go, but defense can be pretty much the same every game. I actually think the zone had been pretty good this year, before the Zags destroyed it. Man-to-man defense is not going to be a strength for Iowa, because the other top teams are generally more athletic, at least among our starters. Against the Zags, I think CJ sitting much of the first half had a huge impact on the game. He would have been the best match up against Suggs, who I think is one of the best freshman guards I have ever seen (and I've been watching BB for a long time). Transition defense was awful against the Zags, and hasn't been very good in most games against quality opponents in years.
With respect to rebounding, Luka can carve out space, often in a good spot, but he can't go get them outside of that space. Weesy is pretty good at cleaning up on the defensive end, but that isn't enough to keep a team like the Zags off the boards. When we had gotten the game under 10 down with a maybe 6 or 7 minutes left, there must have been a half dozen Zag possessions where an offensive boards led to open 3s or lay ups. Sometimes it looked like the Iowa players had concrete shoes the way they didn't react to the ball. That has to get much better. I love the way some of the freshman go after rebounds, but they still have other parts of their game that might not be ready for big minutes.
Good thing we have an elite offense. JBo needs to get it going, and I would be looking to get him started early against Purdon't.