Iowa played their normal defense, which isn't that great. The 5 seniors for Richmond knew how to take care of the ball and generating turnovers is the only thing the Iowa defense has been good at.
Defense wins in NCAA games, because it shows up every game whereas 3pt shooting is highly variable. A top3 offense with 90th rated defense means you get bounced out early--defense has to better, offense can be worse.
The glaring issues all season was Rebraca post defense and requiring double teams, Pmac is a guy withought a position because he is 6'9 but doesn't like body contact. jbo overmatches athletically, Kris Murray tried too hard to make plays and picked up too many fouls/got a bad whistle, especially when he had to play post defense.
Fran made a decision to not try to develop Mulvey/JoshO for post defense...JBO was a 30+ minute player despite defense, and he gave free pass to PMAC to be soft in the paint. Were all those bad decisions, it is unknowable.
We do know Fran has 7 ncaas at Iowa and bounced out in 1st or 2nd game each time. It is a pattern and related to the team construction and Fran's system, although yes, if Iowa had shot better vs Richmond they would have won that game, and then probably would have been knocked out by Providence if they shot poorly.