Although Durant may be the best player overall. I think if you take Draymond away you lose your nastiness and versatility in such a way that I don't think can be replaced.
Admittedly I value what Draymond does more than most--I just think he is the kind of tough guy you need that only cares about winning and is ok with scoring zero points. You can replace scoring from Steph or Durant---but IMO there isn't a guy on the team that can replace Draymond.