At halftime, Lunardi said they would not be in. Look at their schedule - they played no one all year except Stanford and Cal, and they lost to Cal. The one thing a mid-major must do is to challenge themselves in the OOC and St Mary's failed at that. They have no chance in a blind resume test.
Also, all of these teams look good in their conference tourneys, but that's because they are playing against teams of their own caliber. Just like the players that have been mentioned as guys who could have helped Pitt, if you throw them into an ACC level game, most of them would look like mid-major teams and players, not ACC stars.