All of this 'addition by subtraction' talk on the D-Line seems weird to me considering we were in the Top 10 nationally in rush defense.
Sure, we were top 10 in rush yards/game. But we were 32nd in yards/rush. Still not too bad. We also had the fewest rush attempts/game against us.
But the pass rush was non-existent. We were 79th in sacks/game. And 83rd in tackles for loss/game.
Yes, we had a pretty good run defense and our pass rush was mediocre or less which put too much pressure on our secondary and that led to far too many successful pass plays against us. This led inevitably to few punt returns as team punted us deep into our own territory and forced far too many fair catches by Westercamp etal because the high risk to returns too close to our own end zone. And, too many successful pass plays put our opponents into or near our red zone and those possessions will, over the long haul, lead to far to many points given up. A weak pass rush also contributed to the subpar interceptions and fumble recoveries by our D as well. Disrupting the backfield is the single best way to 'create turnovers' by making handoffs riskier and forcing the QB into passing errors and to deflected balls and poor decisions generally. Hitting the QB quicker means less time to throw which means less time to maintain tighter coverages aiding the secondary. A great defense as we all know is the sum of its parts and when any part(s) are subpar, the opponents will naturally tend to want to take advantage. Sometimes you can hide and conceal these weaknesses, especially early in the season when opposing coaches may still be unaware of the weak links, etc. Nate Gerry is a difference maker most of the time. Opponents will attack the substitutes who replace starters as it is only to be expected that injuries and replacements are not as good as the starters.