Edwards is sort of one of those guys who racks up tackles five yards downfield. The Chargers never have great per-carry numbers against the run and he is not one of those 3-4 LBs who slams his head into offensive guards.
Here are the Bolts' YPC on run defense beginning with Edwards' first year there:
'02 - 4.24, YPC NFL ranking 18
'03 - 4.28, YPC NFL ranking 20
'04 - 3.68, YPC NFL ranking 6
'05 - 3.49, YPC NFL ranking 3
'06 - 4.18, YPC NFL ranking 20
2004 was the same season the then new defensive coordinator, Wade Philips, installed the base 3-4 to the Bolts' defense. While I agree that Edwards will never be mistaken for Ted Johnson, I think you're selling the guy short on his run defense.
Look, I don't want to come off as some Edwards homer. Ideally, we'd pick up Adalius to plug the middle. Even a Thomas signing, however, leaves a critical issue with the LB corp unresolved: the need to inject some speed into the corp. It's not just that our LB corp is getting older. They're getting slow.