My theory is that the pressure was getting to Dimma after almost 14 years in the job. Remember, it took a long time to get us out of the quagmire we had been in for decades, then lift the team to the middle and eventually the top. I reckon he was stressed and tired and it rubbed off on the players.
Dimma took on a really difficult and challenging role, it was always going to be a long term project. Once they had reached the top he was probably ready to collapse from exhaustion.
McQualter is not the permanent coach, in some ways he's on a hiding to nothing, but in others he gets a certain freedom. The players look to be enjoying the game more, they look less pressured, and so does Hardwick. I reckon Hardwick is likely realising now just how much stress he has been burying for a long time and he needed and needs a fair break.
DS