DL - Parsons, Mazi, Kneeland, Williams, Rogers. You likely see them try to retain Osa, Golston and Lawson. But that’s a solid 4 at DE if one is retained.
LB - Liafau, Overshown (hopefully back sooner). You likely see another vet MLB signed.
CB - Diggs, Bland, Carson. Lewis likely comes back as he says he wants to be here
S - They likely release Hooker or Wilson and roll with Thomas/Bell opposite of whomever they keep.
I don’t think it’s as dire as you are making it out to be. They definitely need to nail at least 1-2 new starters via draft and free agency.
LB is the scariest of all. But if they sign Kendrick’s back and sign a guy like Dre Greenlaw it becomes a strength