You have missed main two points of my agruement..Any way.
Again , no one questions his ability. It is his present state which is being questioned. His physical faculties are failing. Half the time he is unfit. That breaks momentum of team. It is his lingering on which is questionable.
He should retire gracefully like Gilchrist, Warne , McGrath WHO WERE PERFORMING FAR BETTER WHEN THEY ANNOUNCED THEIR RETIREMENT.