The top of your head is struggling.
WASH STATE - fired from Tech because of abuse to players. (Relevancy?) He has gone 3-9, 6-7, 3-9, 9-4, 8-5, 7-1. 36-35 as head coach at WSU, KF 43-29 during the same time period. (You are looking at a guy building a program from ashes how would these numbers compare to KF's first 6 years? I think he would be ahead thus proving there are viable replacement options)
TCU - Patterson has been there 17 years. Very good coach. Very different climate for recruiting, and gets paid more than KF. (Time flies, TCU was a joke when he got there)
NAVY - is this even f****** serious? ( this is a good reference my point about yohr loop hole on "not like iowa" this was always going tonbe your failsafe but yes they are a valid comparable because they dont recruit like a blue blood) They play in the American conference. 82-44 as head coach IN THE AMERICAN CONFERENCE, KF 76-46 coaching in the BIG TEN during the same time period.
OKY STATE going on his 13th year. Very different climate for recruiting. (3 years off they are 2nd fiddle in thier own state and had 0 identity when thier coach arrived)
UTAH - Since joining the pac 12: 8-5, 5-7, 5-7, 9-4(extra win playing in garbage bowl), 10-3(extra win playing in garbage bowl), 9-4(extra win playing in garbage bowl), 4-3. 50-31 record in the pac 12, KF 50-35 during the same time period(You are willing to acknowledge here is also a coaching showing it can be done?)
SDSU - they play in the mountain west, come on. 60-28 career record playing in the MOUNTAIN WEST.( Again that #2 was going to be your failsafe. This guy is about 4th or 5th down the list of where kids want to play in California)
miss st - Went 6-7 last year! Career record 66-44. Kirk Ferentz's record in same time frame 69-42. (In the SEC they were garbage when he got there and look at his start compared to kirks)
t tech - Kingsbury career record is 25-26, WTF. (I thought they were higher, meh, again zero resources were used.)
Washington - 33-15 at Washington, Chris Peterson is a stud, KF record during that time frame, 31-16.(there are other "studs" who could coach at Iowa)
Again these were teams I listed off the top of my head in about 2 minutes with 0 research. I am not saying anyone needs to go anywhere but the idea we could not get an equal to or greater than replacement is false.