Don't get me wrong: Cora needed to go too. But it was Breslow that put this dung pile on the field. Cora could not make the dung into gold no matter how good a manager he was. Millar said as much in a comment: Breslow should have been the first to go.
And "not the worst" isn't sufficient. They are not competitive and will not make the playoffs. Again. There are no valid excuses for this product being put on the field.