Maybe that would tie in with being relegated to a backwater command, Commander Heath was a bit of a dinosaur?
I don't think D'Oyly-Hughes was a friendly or accommodating Captain to his men on Glorious. From the article you linked I was disappointed to read he kept a loaded revolver at hand on his bridge, and if that is true a terrible signal to send to the crew. Did the young captains of Acasta and Ardent do likewise, even for the poor excuse to repel boarders?
I recall reading an account of one of Glorious' survivors (1 of 10) stating that it was made in no uncertain terms to him by his captain that his ambition was to achieve what HIS captain attained in the first war, a VC. It was made clear it was a driving force and if so then, D'Oyly-Hughes probably wouldn't want much to stand in his way. Tick mutinous or insubordinate crew, hence, the revolver and court-martial. It's probably never a good idea to set your sights on attaining an valorous or otherwise award while serving.
I think it just so terribly sad that all those men that survived that short and needless battle then died of hypothermia.