One of the things you do wrong is to confuse your opinions and the facts. Your opinion is just that and may or may not be correct: e.g. ...."at the US Open in 2012, where Andy was fully fit." Andy had a back problem, possibly as far back as the FO 2012, and you have no earthly way of knowing if he was fully fit at the US Open.
The difference is at that time he was taking treatment for the back. He won a slam.
Now he is back off surgery and extremely rusty.