it's built for D linemen to absorb blocks so backers can make plays. Problem is, they don't have the LB's this year, that can make those plays. And, your passiveness toward how much you need (or don't need) DE's to make plays, has led you to put a couple of poor DE's on the field, trusting in system, over DE's that can make plays.

Those D lineman still need to be able to make plays.