If it is a difficult thing to recruit rebounders and serviceable post players to ISU, then Prohm needs to hire an assistant who can coach up smaller guys to be serviceable at these positions. It's not easy to play those positions as an undersized guy, but there are techniques to help make things go better, and the ISU players who are having to fill these positions, particularly Burton, don't seem to know how to handle bigger players. This has been a problem for years.
The TCU Russian kid had some nice moves, but he was no superstar. He was tall, and ISU seemed to have no real idea how to disrupt him. Also not sure why ISU wouldn't try Young and Holden on him earlier in the game for a just a few minutes anyway. It becomes tough to win when the opponent is just abusing the post. But Hoiberg was the same way in just sticking with the rotation and somehow hoping that things will change.