I think it’s more the outcome of the accumulated injuries creating shortened rotations, especially at corner.
Two of the injured returning players will be former ABT honorees at corner. They never forgot how to contribute.
TA Jr., who was the 3rd/4th LB in his position group, was lost for the season. IU had 3rd stringers play some snaps, to give 2nd string starters a blow. In general, I think, ‘tired‘ or other ‘underperformance’ is perhaps better explained by the reduced level of talent on the field. (Jerome Johnson and Jamar Johnson were sorely missed when the injuries piled up).
Not only that, but 3 and out after 3 and out coupled with horrible punts from our true freshman last year at times put our defense at a disadvantage.
Statistically speaking, and I'm going off memory here, we weren't that far off yards allowed from the previous year. Where we really struggled was we didn't get any turnovers last year, which also put us in a bind to go with all the injuries we had.
Last year was a struggle all around.