The point that is missed by some here is that the refusal to play was entirely symptomatic of his general performances in a Latics shirt.
He had no interest in challenging for the ball and made a habit of arriving 2 seconds behind where the ball had just left. Any player should have a pride in their performance that was absolutely lacking in his.
I don't personally have an issue with the cup 'refusal'...... but if Swansea gave him the all clear and he refused to play, Dunn should have thanked him for his efforts and terminated the loan agreement on the above grounds.
He clearly ha