I think the reason Hayes played less today is that Egbunu was playing so well and White doesn't have those 2 on the floor at the same time. Most of the season either Egbunu got in foul trouble or Hayes was just playing better so he got more minutes than he did today.
Hayes is better with the ball in his hands. Egbunu is so good defensively and on the boards that he has to play. Egbunu was disappointing early in the year but he's living up to expectations now. He's probably the best rebounder in the league.
Defensively you can see how this team causes serious problems. Hill Robinson and Chiozza harassing the perimeter and Egbunu in back is pretty serious. Rest of the guys are good athletes and try hard too.