You aren't wrong. This entire conversation gets old, as all anyone wants is for Iowa to win. This site tracks overall team efficiency with different lineups on the floor.
EvanMiya CBB Analytics
Of the 5-man lineups this season Iowa has used with at least 50 possessions, the Garza/Bohannon/Frederick/Murray/Wieskamp lineup is by far the most efficient in adjusted efficiency margin. The second most efficient lineup is Iowa's starting lineup, so it's not as if that group is bad.
What is also interesting is the teammate chemistry, where the adjusted efficiency is measured when different sets of two teammates are on the floor together. I would encourage folks to look at it. If you go to the Team Breakdown tool and then both the 5-man lineups and the Teammate Chemistry you can see for yourself.
Fran has done a wonderful job with this team. Coaches get criticized all the time, but it's time to give credit where it's due here. I don't know how he did it, but he got this year's team to buy in on defense for the past month or so, and the results have been dramatic. It doesn't mean Iowa will make it out of the first weekend of the NCAA tournament. Stuff happens. But the team found defense, don't know how. But kudos to Fran.
With that said, when looking at all the regular and advanced stats I don't understand how Murray is not playing 25 minutes per game. I don't even really care who plays less so that he plays more (other than Garza) but he needs to play more. For all the blather here about how the "feeding the post" skill suddenly became the most important skill in all of basketball, the most efficient lineup Iowa has run out there all year involves Murray.