If they are one and done, you blow up the entire coaching staff. Yes, even Moore and Quinn. You start over. You have only one shot to redeem Dak, if that's even possible. You are tied to him for a few more seasons so bring in a young, innovative offensive mind and just start over.
Also, Jerry, you dumb monkey butt, re-prioritize your positions. Running backs don't matter. Defensive tackles do. You can find running backs anywhere. You've tried to cheap it at DT for years and what has that gotten you?