In the preseason Dario was the second biggest difference maker after KG defensively. When he or KG was on the court, we were usually playing winning basketball.
When he was on the court he gave us size, strength, shotblocking, rebounding and hustle. Those are things we are sorely lacking this season when KG sits, and while Dario may not have been starter material, he'd have been an absolutely perfect substitute center.
With Darko gone the next player we have who could give us some of those things is Fab Melo. If we want any hope of improvement without a major trade, it unfortunately tests on Fan's shoulders. We NEED a big who is a shotblocking threat and who can defend the paint when KG sits. If we cam get that, then the return of Bradly should help with the rest.