Bob Jewett said:I think you should read what he actually said on the subject. The practical test to see if you can get overspin is in his "Advanced" book.
On the Jacksonville Project video, what I call "retrograde" spin was visible on one sequence. By retrograde, I mean that part of the cue ball is moving backwards relative to the table just after being struck by the cue stick. For a follow shot, this would mean that as the ball leaves the tip, the bottom of the cue ball is moving towards you not just relative to the center of the cue ball but relative to the table.
On a train going north, there is a part of every train car that is moving south at all times. What is that part?
Whether retrograde spin can be achieved depends on how well your tip sticks to the cue ball. Whether it lasts over a significant disantce is for you to test under your conditions.
I read his books again and I admit to simplification in writing the question. Byrne says that "overspin" follow on a rolling ball is negligiable because it cannot last long. However, I do not feel that this voids the premise of the question. Other "pro" teaching videos I've watched claim that you achieve overspin on a force follow shot, which contradicts Byrne's statements. Although I agree with Byrne, I am interested in the debate.