Green Bay fans, thanks for all the insight. I appreciate it. It sounds like Sherman would be an excellent coach (I like conservative with tough D) and I'm excited he may be here.
To answer a couple of questions...Jerry Grey would run a pretty good D for you guys if you had the right personnel. He runs schemes he learned from Gregg Williams and Dick LeBeau, so expect your D to look like Pitt or Wash. He has traditionally been very good at halftime adjustments, in 04 the Bills D didn't allow a 3rd quarter TD all season. We stumbled badly this year, however.
BUT, and its a big but, if you don't have the right personel, you will get beat by the big play. Last year (04), our D constantly went for the big play, and usually made it. We came up with a bunch of turnovers and sacks. In 05, we REALLY missed Pat Williams (who should have been re-signed by our then-idiot GM Tom Donahoe) and the run D suffered. Consequently, we had to commit more people to run-stuff and were unable to be as agressive. Losing your best player to injury, Takeo Spikes, hurt as well.
Bottom line is your D would probably imporve for a year or two, until the league got film on you and figured out how to beat the schemes. Of course, then you may be in rebuilding mode as Favre would retire and Grey may have moved on. It really would not be a bad move for you.