No two teams are built the same, nor do coaches/GM's address their roster the same. Also, defensive philosophies are different, that is all ok. And there is more than one way win. I agree they dont have a game wreaker but those guys are hard to come by. The "rotation" is not the Bills problem. Rosseau and Basham were not stunted because of it.
The Bills with their roster this year could easily have been one of the two left still. The problem was coaching/playcalls with 13 seconds and not the rotation. But they DL was tired, that was obvious.