“Duke plays a very difficult schedule. UNC 2X, Boston College, Syracuse, Northwestern, Virginia, Notre Dame 2X, Penn. Thats 9 games vs Top 20 RPI teams (5 games vs top 5 RPI teams).”

Duke plays a weak non conference schedule and lost 8 out of those 9 games you mention .They did not deserve to get into the tournament because they won 1 significant game and their out of conference schedule was an embarrassment for any team that considers itself to be a top level team .