Different coaches different schemes same results. It is lack of good players.poor tackling and technique and way too many big plays.
Therein lies the problem, this is definitely not the "same results".
2022 (Nowinsky):
Scoring Defense: 42.0 points/game
Total Defense: 578 yards/game (2d worst in the country is 538)
Rushing Defense: 197 yards/game
Passing Defense: 381 yards/game (2d worst in the country is 336)
2021 (Collins):
Scoring Defense: 30.3 points/game
Total Defense: 433 yards/game
Rushing Defense: 194 yards/game
Passing Defense: 239 yards/game
2019 (Collins):
Scoring Defense: 26.5 points/game
Total Defense: 404 yards/game
Rushing Defense: 167 yards/game
Passing Defense: 237 yards/game
2018 (Burrow):
Scoring Defense: 24.6 points/game
Total Defense: 391 yards/game
Rushing Defense: 137 yards/game
Passing Defense: 254 yards/game
2017 (Burrow):
Scoring Defense: 24.2 points/game
Total Defense: 372 yards/game
Rushing Defense: 111 yards/game
Passing Defense: 261 yards/game
Taking some averages
Points TotYds RushYds PassYds
Nowinsky 42.0 578 194 381
Collins 28.4 418 152 238
Burrow 24.4 382 124 257