Step one for Miller is sitting anyone who doesn't pursue every rebound and box out. Those are energy/effort plays. Regardless of if Miller can coach offense, he clearly isn't going to manage it well this year with these players (whether it's lack of time to coach them or lack of players to run his O or just that he can't coach offense).
So do what he said he would do, be Mick Cronin 2.0 (at least for this year). You don't defend, box out and rebound you don't play. If that shrinks us to 5 guys who play, so be it (it's probably optimistic to think we have 5 guys who can rebound right now to be honest). Defend, rebound, don't turn the ball over and you can win games without much offense.
There are two plays I recall where Nunje was out near the 3 point line when the shot went up and crashed the glass because the guy guarding him ball watched when the shot went up and he easily got around them and to the rim. Once it was Ody, the other time it was MAW. The poor rebounding starts at the three point line with guys not getting a body on their man and preventing them crashing the glass.
Our rebounding numbers were simply horrible. Only two guys were even somewhat good: Lakhin with 6 rebound in 16 minutes and Ado with 5 in 18. Hensley had 0 in 9 minutes, Ody 1 in 8 minutes, Koval 2 in 10 minutes, Davenport 3 in 24 minutes, Newman 3 in 28 minutes. Xavier had a 46.6% offensive rebound percentage and honestly if they hadn't let up in the last 8 minutes, they may have been over 50%. Meanwhile we were about 30% OR%.
Shrinking the rotation is tough right now because no one outside of DDJ, Saunders and Lakhin consistently plays well enough to be on the floor. I would start those three, plus two of Ado/Newman/Davenport - the three who sometimes play well and sometimes suck. Get every possible minute you can out of those 6, give Ody/Hensley/McGinnis some minutes to develop them and leave MAW/Mason on the bench until the figure out how to shoot the ball (and play defense in Mason's case). Koval has no business stepping on the court in another game. He's not going to be here next year, so nothing to develop and he's not good enough to play in the American as is (or even close to good enough).