Look, the only part of this that warrants a response is the OL. Unlike you, I have seen individual improvement and improvement as a whole on the OL. The four main guys that will start next to Proctor have gotten better the last two seasons. You can believe that or not, but its true. They were going to be a good unit next year without Proctor. With Proctor, you have an anchor at the most important position, and then you have a lot of size and experience up and down the line. They could be good.
What no one wants to talk about is that the OL can only do so much with poor QB play. BF and KF have put tragically bad QBs out there for 3 years straight. Petras was a statue that suffered from beaten puppy syndrom. The other kid was worse. This past year, we never saw McNamara as anything other than a one-legged QB. Hill was the worst QB in the history of the program. Are those things KF/BF's fault? Yes, they recruited poorly for the position and stuck with losers way too long.
The success of the new OC and Iowa's offense will, SHOCKINGLY, come down to QB play. If McNamara remains injured/ineffective, and Iowa runs Hill out there at QB, then the new OC will fail and there is little the OL can do about that. But, if the new OC can elevate the level of play in the room that he has sat in as a player, position coach, and head coach his entire adult life, then the OL will be a good unit and support that improved QB play. One cannot have an effect offense without good QB play. That is the ingredient that has killed Iowa of late.