if you want to microanalyze KenPom, just remember that the current adjusted D rank is not solely how their D has performed this season. It still has a decent amount of preseason prediction baked into it.
Torvik lets you slice and dice the data. His system has Iowa #1 in offense and #115 in defense. If you strip out the preseason predictions on Torvik it ranks Iowa #2 in offense and #143 in defense (though moves Iowa up from #8 overall to #6 overall).
I think people focus too much on the individual O and D numbers, when the overall number and rank are infinitely more important. The entire world can see that Iowa is a lot better on offense than defense. That doesn't make them better or worse than a team with a similar overall rank that is similar in quality of offense and defense, it just better describes ways in which they win and lose. If Iowa loses a game in the NCAA tourney, it will probably be a shootout where they can't stop the other team. But that doesn't make them more likely to lose a game in the tournament.