The swap in defense with Favors is really the swap of Favors for Green, assuming he starts. The bulk of Favors' minutes were at the 5 so it's really Favors at the 5 vs. Ed at the 5, and Green at the 4 vs. Favors at the 4. I think Green wins out because playing next to Gobert, we needed a four who could defend the perimeter, which I think Green will do better than Favors.
Favors played 8-10 of his minutes in the starting lineup, and he was a pretty good perimeter defender. We should be so lucky to have Green as good as Favors there.