I think Hardin was drafted as the replacement/upgrade for Steltz. If Hardin is healthy and plays to expectations, Steltz will be gone.
So much of what we do regarding defensive personnel is going to depend on whether Marinelli is kept around or not. If he stays then I see the draft being predominantly about offense but if we hire a new DC then all bets are off and our new OC is probably gonna have to make do with more of our current players on offense than a lot of us would prefer.
Personally I don't relish the idea of churning our defensive roster at all, simply because of the serious work we have to do on offense. I will be very nervous if we don't come away from this offseason with at least 3 new starters for the OL between FA and the draft. Garza has never been a true C, he is getting old, his play slipped significantly this year and he is not the leader on the OL that the C is supposed to be. Our LG position was a gaping wound all year, and I have zero confidence Carimi will be much (if at all) better after this offseason than he is now.