Respectfully, not seeing it.
Here is a link to the portal history.
2019 College Football Transfer Portal Position Rankings
247sports.com
Reviewing this data from 2020 to-date, the in-bound transfers who made little to no impact seem to outweigh the in-bound players who stepped in and made an impact.
I draw a much different conclusion. Here is a list of who we got from the portal, using the 247 site, and which guys contributed vs. not.
*guys that earned at least HM all-B1G honors at Iowa
note: players from NAIA or CC not on the list as they are not on the 247 site, so this excludes players like Seth Anderson, Hayden Large, Kaden Wetjen
2019: Charlie Jones* and Michael Sleep-Dalton*
2020: Coy Cronk and Jack Heflin (Cronk started the first 2 games, and then was sidelinted by injuries)
2021: Xavior Williams (ST contributor all season, started 1 game at SS)
2022: Steven Stillianos (played in 8 games his first season, played in all games his 2nd season, starting 8, won the coaches appreciation award on O)
2023: Rusty Feth*, Nick Jackson*
2024: Brendan Sullivan, Jacob Gill
2025: Mark Gronowski, Jeremy Heckliniski (projecting), Hank Brown (projecting), Sam Phillips, Bryce Hawthorne, Jonah Pace
Guys who didn't contribute, or who outright stunk but were still put into important positions to contribute:
2019: Oliver Martin, Jack Combs (walk-on from C. Mich)
2020: Matt Lorbeck (walk-on from N. Ill)
2021: no one
2022: no one
2023: Cade McNamara, Deacon Hill, Kaleb Brown, Daijon Parker
2024: Jackson Stratton (almost inclined to count him as a win, he was added simply for QB room depth and he won both games he started for us); Cade Borud (walk-on)
2025: Bryce George, Shahid Barros, Ty Hudkins (did not play, but has 3 years of eligibility left)
My conclusions:
We have used the portal to build depth, and we have been overall successful in this regard.
When we have really needed it (e.g. QB), we are not batting a great percentage.
We have been burned by some bad injury luck (Cronk, McNamara), but those guys came in with injury history, so it was buyer beware.
P4 castoffs who left because of lack of playing time have not panned out: Oliver Martin, Cade McNamara, Deacon Hill, Kaleb Brown (jury out on Hank Brown and Jeremy Hecklinski).
Guys from lower-levels have made up most of the contributors.
Guys that came in with multiple years of eligibility were generally much more impactful AFTER their first year at Iowa.
It feels like we are using all of this experience to build the optimal portal strategy for Iowa moving forward, and they seem to be executing that strategy this off-season.