This was a fantastic win and is historical, but at the end of the day, it may not (yet) mean that much. Iowa still has four games to go, and none of them are given wins.
Robs kick against Michigan was an all-time classic, but it ended up not meaning enough because the Hawks lost to Ohio State a couple of weeks later, losing their #1 status.
The Cap One victory was the best possible outcome for Iowa that season. It was the best play in Iowa history because there was no tomorrow for that team as it existed. It was a January bowl game, against the former National Champions (just the year before), and there was no hope for anything better than a win that day.
I'll agree with the member that said to ask again in January, though. If Stanzi were to pull out the same drive for a National Championship, or Rose Bowl victory, that would definitely be the best play in Hawkeye history (of the last 50 years, that is).