I continue to disagree with the notion that KF is someone putting restraints on system and play calling. To my understanding, KF has never been an OC or play caller in his life, on either side of the ball. He was a position coach or HC.
At Iowa, he has not dictated the type of offense to be run or play calling. KOK ran a pro style offense, then Davis brought in a completely different (and stupid) horizontal type offense, BF somewhat reverted back to more KOK concepts, and now by all accounts Lester has been allowed to implement his offense that is totally different than BF's in terms scheme and terminology.
IMHO, the issue with Iowa's offense has not been some mystical governor that KF has dictated to his OC's about running antiquated plays and schemes. The issue has been that KOK was an average OC at best, and then KF made two really shitty hires in Davis and BF. Davis' best days, if he ever had any, were well behind him and BF was a singularly untalented OC/QB coach.
I firmly believe that if Lester lives up to his pedigree, he will be successful at Iowa and KF is going to let him be successful. Will he put up video game statistics? Probably not given Iowa's righteous defense and KF's complimentary football approach, but Lester can be very good at Iowa. Don't get me wrong, KF is totally responsible for Iowa's bad offense, but the blame is in who he put in charge of the offense, not what he did or did not do to impact how the offense functions.
As for the BF experiment, there is no one to blame but KF.