Who's better on the roster? Keiser is not great, but he's the only one with a semblance of pass rush skill.
Acho is better. Alexander is a ST captain. Martin is more versatile. Shaughnessy was key to our rush defense.
Also, our pass rush is missing from our nickel defense which relies on DEs vs OLBs. Vs a team like the Broncos who run so much spread, 3-4 OLBs who aren't DEs are less useful.
Personally, Kaiser has flashed some pressure, but he gets rolled vs the run, and hasn't been able to finish sacks. Now, Okafor is getting Shaughnessy reps, and we will see how much playing time Kaiser has earned.