The 'under the arm' Clubcover or towel drill is what people -- even great golfer people -- do when they don't know the existence, the purpose or the motion of the #3 Accumulator from Release to the end of the Follow-Through and the subsequent On Plane Swivel to the Finish.
Great stuff, Bucket. You have come an unbelievably long way in such a short time. I am so proud of you!