From being dominated to dominating in one year, it’s quite a stretch
Just looking at it apples to apples. Minnesota ranked 56th in total defense in 2023 the year before Hetherman, then leaped to fifth nationally in total defense in 2024 with him as DC. In the same time Miami ranked 24th nationally in total defense in 2023 and 27th in 2024 under Lance.
Hetherman took over a Minnesota defense featuring only 2 top 150 players (one being true freshman Koi Perich), two more low 4 stars and the rest were low 3 stars or unranked, and not one of them ever making an all conference team.
On the other hand at Miami he gets:
5 former All Conference players
Bain (also top 150 four star)
Mesidor
Blay
K. Scott (#1 JUCO CB and 4 star)
Toure
4 former five stars
Lowe
Scott
Lightfoot
Blount
2 former Freshmen All Americans
Poyser
OJ
8 additional former Four stars
Wesley
D. Brown
M. Bryant
PoPo
Pickett
A. Jones
Pruitt
Lucas
The big difference between Hetherman and Guidry is Hetherman is coming from the Big Ten and has consistently contained much better offenses. Hetherman also inherits much better talent, this 2025 defense is by far more talented than the 2023 or 2024 defense. As I stated before Jadais Richard and D'Yoni Hill are not close to Xavier Lucas and Ethan O'Connor. 2023 Mohamed Toure was better than 2023 Cisco Mauigoa and so on and so on…
All of this is speculation. Just looks like Miami finally has a DC who knows how to maximize his talent. So with Miami players, playing at their full potential, being played in the same position as the Minnesota players, these Miami guys can be dominate.