I agree - I think this defense is made for a rotation of Washington, Dareus, and Williams inside. I think Shaq Lawson and Hughes on the outside as rush DEs will also bring the pressure.
I am a bit worried about depth, but I think the 4-3 is the correct defensive fit for the D-Line and if we can get some help at LB via FA or Draft - I think this Defense will come back around pretty quick.
I thought the exact same thing - I know they were Rex guys, but I did not think they fitted his defense as much as the 4-3 under Schwartz.