The reality is, this is your opinion. Your argument is based on the information you have. I would argue that JB has far more information than you. We don’t know what considerations were in play. If JB started KR mid season would he have been placate? Maybe. Maybe not. Perhaps JB felt from the beginning that KR was a goner for some reason we don’t know. In that case, why punish JG? Maybe he was trying to motivate KR who was dogging in practice. Again we don’t know. Would KR have been happy with starting, but playing the same amount of minutes - 21 average and finishing many games? If not, how many minutes would make him happy? 25? 30? 35? 40? Obviously making one player happy is not the mission, winning games is.
Again, you don’t have a complete picture.