Whether or not he hit the wall is irrelevant. Elmore said that his tiredness cost Duke. As 4decadukie already stated last season Duke won a Regular season ACC Championship (in a tie with Maryland), the ACC Championship, a #1 NCAA Tournament seed, a trip to the Final Four, and the National Championship. So while one can certainly argue that Jon's minutes may have cost him some individual awards or production it did not cost his team anything. They still won all the titles available to them.