Missing Merriman, Williams and Kelsay didn't help against the Giants. But Edwards is in WAY over his head, has been since he took over as DC, and Gailey's misguided sense of loyalty towards him is troubling.
We have NO bona fide pass rusher. So I would take issue with your first sentence. This is a passing league and if your defense can't dial up some legitimate pressure on an opposing QB, you are eventually going to pay the price. We can't so we do. Stats prove it.
Besides, I don't have any confidence that Edwards would effectively use the aforementioned bona fide pass rusher, so it's a moot point.