Pretty much all of this.
Cooper hasn't lost the dressing room. He barely had it in the first place.
This was a group of players (minus KDH now) that was very much a collective force last season.
Promotion is great and the PL is difficult once you've stepped up, but to have such a stark contrast within 6 months is bewildering. Not least disappointing.
Cooper can cop majority of the blame. Some players also. But once again the head honchos need to take some responsibility for making what seems to be another huge mistake. Again.