what do you use to justify Dundee being a "far bigger club than any others out of the top 5"?
Dundee have a smaller turnover than Kilmarnock, though both around the £4m mark. Not sure what the Motherwell or the Saintees turnover is , but it will probably be ner £4m as well.
The gap from Dundee (or Kilmarnock) to Aberdeen/Hibs/Hearts would indicate that they are far bigger clubs than the rest who are all much of a muchness..