The Despres trade was/is awful and never should have been made regardless of anything, but I doubt Pens' management would have traded him if they didn't believe Dumo had AT LEAST top-4 Dman potential, if not higher.
A 6'4, 200+lbs top 4 NHL Dman who will be playing as soon as this season has higher value than any of our prospects besides Murray as it stands right now. Sundqvist is a sure bet but may only be bottom 6. Sprong may be top-6 but has some big ???. So again, Dumo continues to be underrated around here.