I agree that some type of leadership/intervention by the coaches may have done wonders.
However, to your second point, have you not noticed a real reluctance by X and Trey to give up the ball to open players from the beginning of the year, sometimes to even laughable measures? I think that it had become a barrier to winning that the players were all well aware of, I would believe it was not give me the ball but rather get the ball to the open man. Also, better to address the problem after a win than in the throes of blaming teammates for a loss, IMO.