But if he persists, he will start setting up with clubhead closed and then flipping it further closed through the ball. He will either slice or pull-hook. Some do this for years and become basically unteachable.
But then if he wises up and takes some lessons, the pro fixes his grip and his setup and especially his posture. He shows him how to turn his shoulders around his straight spine, take it up and then lay it off onto the plane to swing through. That new correct top position triggers him to start with weight shift and hips, and suddenly he finds himself making a classic finish!
AND it cost less than the price of a driver.