I think that's an over-simplification. They got D-Linemen in FA and the draft (Hardy & Gregory). I think that filled out Marinelli's "rotation" of players he wants to move in/out.
They wouldn't have to overdraft LB if they would just grab 1 decent space-eating DT. With better blocking up front there would be fewer injuries to the LB corps.
Hardy has the size and technique to play LDE, but they are putting him at RDE to get the best possible pass-rushing matchup. I suppose Mincy will slide to LDE so that should be an improvement over Selvie and help the strong side.
So that protects Hitchens, but with Crawford/Lawrence penetrating, Hayden overmatched most of the time, and Hardy/Gregory/Lawrence rushing-- where's the protection for the MLB and WLB?
All you needed was some stoutness and solid technique at Hayden's position and then everything takes care of itself. Lee and Wilson can fly to the ball and take down the occasional FB or TE. But with Hayden pushed backward by a single blocker an extra lineman also get shots on the LBs, and that's a killer.
Largely because of this Dallas' defense was weak to start with and was a M*A*S*H unit in Green Bay.
Hayden is killing us.