I am with @NorthKCHawk , I think Stanley is under-rated by most Iowa fans, and we would have been much better with him last year. He made plenty of big plays against Iowa State, Minnesota, and Nebraska, and last I checked, those were pretty big games.
Check out this recap of the 2019 ISU game for some excellent Stanley plays. He wasn't perfect, so if that is the bar, rip away. But there are a lot of winning plays made in that game.
A strange, weird, befuddling game ends in a win for Iowawww.blackheartgoldpants.com
And this is a highlight film, so of course it leaves out the bad plays. But you will see lots of good throws in games that mattered: https://www.youtube.com/watch?v=OgJC3tnt1Yk
It is hard to get some of his bad misses out of your head (he cut way down on those his senior year). But on the whole, he was a really good QB for us.
IMO, of Iowa's 4 losses, the only game that NS would have made a difference in would be the bowl game against Kentucky. He wins that game. He isn't beating Purdue, Wisconsin or Michigan...if Clifford doesn't get hurt he isn't beating PSU either.