He is on the bench, just not playing. It appears he's 3rd string behind Hornbeak and Cousins.
Grooms is not playing defense at a level Kruger wants. I know that he looks good on the ball and all that. But, there is more to it.
He did just get blown by like a stone on defense there, but oh well.
This happened two possessions in a row at the end of the game. For some reason (looking for a screen?), Grooms would look away to the side, his man would see this and then just blow by for a layup. In a game where baskets were precious, these defensive lapses were killers.
I wish Grooms the best, but it looks like 5-on-4 when OU is on defense and Grooms is in there.