At what point does everyone acknowledge the trend of Rivers, Irving, Jabari, Okafor as incredible, top-5 offensive talents as freshmen that Coach K can't teach to play even average defensively? Is it what he's targeting? What he's emphasizing? What he's not holding them accountable for?
Okafor is absolutely unbelievable offensively, but it's almost harder to comprehend how bad he is on defense. If he were even adequate, he's the best player in the country, but he's a liability late in games and Duke is lost without him.
As a team, as awful as that Duke zone is, and as clearly uncomfortable as they are in it, for Coach K to stick with it tells you all you need to know about how incredibly terrible they are in man to man.