Clearly the Indiana guys driving to the hoop at will were more athletic. Johnson, Williams, Anuoby pretty athletic group. Jok couldn't guard or get free for shot
No, its not clear. Its an assumption on your part, and an incorrect one, other than Jok who isn't very quick. They did not get to the hoop at will, they penetrated the zone, often times using screens, and Iowa over reacted leaving shooters open.
When Iowa played man they kept Indiana in front of them.
The best defensive players aren't usually the best athletes anyway so its not an accurate way to gauge anything.
Fran should have never gone back to the zone, that was a big reason Indian was able to get the first lead and then get the second lead.