Resigning does make his case more difficult but he'll claim "constructive dismissal" - that he was really given no other choice.His mistake was resigning.
Should’ve told them to go f*ck themselves.
Media statements from the Essendon president shortly afterwards support this. Without looking them up they were along the lines of "Once we knew about his views we took firm action".
That doesn't sound like someone jumping voluntarily, and I thought at the time that media statements like this were extremely unwise.