It's a good thing that Carr didn't break his sack record from the previous year. Davis is part of that , the Offensive line and the coaching staff is equally responsible. It doesn't make good football sense to bounce your franchise around the turf and expect him to be healthy for long.
However, we should not mistake good numbers for good offense. The goal is to put points on the board and win ballgames. The question is did we win more ballgames with Davis than without? If so, then "What DD did for the offense?" is simply help them to win.
We're on a mission from GOD.