Just a reminder: If Wommack leave for whatever reason, please remember that we have Mo Lingust and Chuck Morrell as Co-DCs. One of them, likely Morrell will step in as DC. I can see Lingust getting the nod, but could go with Wommack. But anyway, the point is i wouldn't worry about on defense side on who steps up.
On offense, If Grubb goes, I can see Sheridan slides in as OC, or he can go with Grubb. Who would step up as OC? It has to be someone who can work with Russell and maximize his skillset. So I think they're going to be fire whenever they hire.