Ok going from 30 -32 in Rushing Defense, technically is getting worse. But lets be honest, it isn't getting that much worse. The pass defense basically stayed the same, but improved a little because teams knew they could rush on us. So what does that say IMO? With the same basic players, in a different scheme, we still couldn't stop teams offenses or running attacks. So maybe, just maybe, its the players. As I recall, when the Bills were playing the 4-3 people were screaming and yelling about how much we need to switch to the 3-4.
You can't make an omlette without breaking a few eggs. It will take time to develop this new system. Its not an overnight fix.