Not saying it is or isn't Corbins fault but that is only partly true IMO. The system he's running maybe they should be cutting but aren't for whatever reason or when one person misses the timing it trickles down and then everyone is out of sync. I would think the weak to non existent screens they set would be a good example of poor execution and then that throws off the rest of the play.
I guess if I believed Corbin was telling the players to not move, cut or set good screens I would want him fired as well. I think it is more poor execution, why that is, I'm not sure, could be he or the other coaches are poor teachers which would be on Corbin. Could be players not having confidence or are trying to learn it or other things, but I'm just throwing it out there.