I agree with how the downswing should happen, and in the order described. However, the proper downswing action is allowed to happen because of a proper back swing, one that loads and puts things into place. Things happen in reverse order in the golf swing. we start back with the hands and the feet are the last thing to move. We start down with the lower boday and the hands are the last thing to move. So, we must first cup the right hand and then let it cock so that the reverse on the downswing will be uncock and then un cup. If we cock before we cup, then we will uncock on the down swing before we un cup.

WHile I know there are many types of back swings on tour, they also have many similarities, most tend to have a flat left wrist at the top, they have maintained spine angle, and have built up tension. People who dont do that have to make compensations, and some tour players do.