"Slightly" worse? At Iowa Davis went to the tournament 9 of 13 years, never bowed out in the first round and added an Elite 8 and two Sweet 16s to that. I contend that that resume is a lot better than what Mad Fran has compiled.
As much as I like to make fun of how much Iowa fans write off his first few years, Dr. Tom took over an absolutely loaded roster. Once he had his program in place, it's honestly not that different. Mostly around .500 in the league, slightly better sometimes, around 20-10. Got first sweet 16 in his lame duck year, which again was the first one since he had his own players.
Same reason why Prohm is not a good coach despite making a Sweet 16 here. Once the players he inherited were gone we sucked.
Take away the first 2 seasons of Dr. Tom and Fran, and here are the numbers:
Dr. Tom: Overall - 19.5/11.4, Conf - 9/8.6
Fran: Overall - 21.2/12.4, Conf - 10.3/8.5
Difference is Tom has 1 S16 to Fran's zero.
That's not a huge difference.
Either way, in the last almost 40 years, they've had one coach do a little better, one coach do a little worse in Alford, one coach do way worse in Lick, and now Fran. I'm not convinced there is some higher level they can achieve barring some incredibly special coach.