I do think the pressure of trying to win for K is getting to Duke's players. If their opponent can keep it close Duke starts to tighten up and you can almost see the stress and pressure start to rise. And once they reach the NCAA Tourney and they're facing the possibility of each game being K's last game ever the pressure is only going to get even worse.
And it’s all his own fault since he had to give himself a year long farewell tour.