Yeah, people get all sensitive and overwrought about these things.
Of course there are plays all the time when a good call is made and a player or players just make mistakes. There are obvious ones, like the QB overthrows a wide open receiver. Or a receiver drops a pass. Or a lineman forgets the snap count and doesn't come off the ball and gets beat. Very rarely, if ever, does KF or staff call out an individual player after the game even if everyone who watched the game know what happened. It is literally a nothing-burger if BF in one of these lengthy interviews (when reviewing film) says that play was a case of poor execution. The failed halfback pass in the Big 10 title game is an example. Formation, area on field, situation all fooled Michigan. Pottebaum is wide open but he falls down going after the pass from Williams. It happens.
I listened to the lengthy podcast with Leistikow and my reaction is meh. Yes, the job of an OC is way more complicated than the fan in the stands or watching at home realizes. But okay, that's the job. His entire tenure as OC, Iowa hasn't been efficient throwing the ball, outside of one year with Hockenson and Fant where Iowa was very efficient in the red zone. Either the concepts being taught are too complicated and/or not effective in today's football, or they aren't being taught very well to the players. But in 5 years it by and large has been the same thing throwing the football. Either get it figured out or get someone in here who can.