Gotta be honest, I don't think it's as scary as you may think. Sure, I expect Ziggy, Slay, and Levy to have great seasons. I think that's great players at three levels of the defense. And Quin is generally very solid.
But you have Byrd and Matthews on the definite downswing of their careers, Diggs took a major step back last year and may not even make the Lions in 2017, Nkemdiche has to show he can even get on the field.
I do like the potential that Jihad Ward brings, though.