Somehow all the theories on "proper" ways to play and stroke the cue ball begin to break down when you watch great players like Trump, Biado, Efren, Bustamante and Shane play pool. I have always said there are as many different strokes as there are pool players. Who is to say what is the correct way to stroke the ball. Most of the so called "Theorists" would love to be able to play the game as well as those mentioned above!
I'm not so sure all the great players with "faulty" strokes would play so well if they somehow corrected their faults. I do not think there is one right way to play pool or stroke through the cue ball. In my lifetime I've seen exactly one Buddy Hall, who made the best hit on the cue ball of any player ever imo. He actually could hit dead center cue ball over and over again. The sound the cue ball made when struck by Buddy's cue was the cleanest you ever heard. But he was unique and that doesn't make all the rest of these great players wrong because they can't do that as well.