My optimism is diminishing, but I still won't resort to pessimism at the moment. Grill was likely another year away from being a force. He probably would've been able to soak up some minutes and be solid next year, but it still looked like he was a little bit away from truly being a Big 12 contributor.
If Solo, Bolton, Jackson, Conditt would've left or one of the guys in the 2020 class wanted to be released from his LOI (Foster or Blackwell especially), then I would probably lose all hope. Grill leaving stings because he could've ended up being a leader in the future for this program, but as far as production wise we're not losing a tremendous piece.
I know we're obviously in different situations as far as the program goes, but this sort of feels like the Clayton Custer situation. If Prohm is heavily going after guys that are guards / wings that are very likely to compete for his minutes, and then you add in the fact that the 3 out of the 4 2020 class can all play that 3 position as well as Johnson, I can sort of see Grill being intimidated by that and wanting to find a better place to get significant minutes. Custer wasn't going to start because Monte, Naz, and Matt were in front of him.