If you go to :50 and study this particular shot Harold is faced with, it's an excellent example of some of the things I try to point out.
The opposite corner of the table is skewing his body toward forcing his grip close to his body, but he appears to want to put high center right. His first strokes are curvy, he get's back up and re-formulates because it's pretty obvious to me, he understands whats going on here and what is required and what is the solution.
He get's back down with a more cognizant stroke awareness and emphasis and I completely understand what's going on here because I work on the exact same things.
It's very hard to maintain that shaft angle in that position and in this case, a clockwise grip roll to compensate is death in my opinion with that bridge length. It will often betray you and could in fact drift out too far right and miscue, which doesn't make sense really, because when your grip is close to your body like that, it tends to skew the stroke inside instead of outside.
However, it depends on grip close to your body AND how parallel your back arm is to the shot line. If your back arm is chicken winged inside, then you could use a clockwise grip turn more reliably. So the feel of the grip close to your body is not always a green light to a typical working solution.
Thats what makes this game very very involved.
Now, I also know, they played with a fat mm tip on average back in those days and Harold's tip certainly is fat. He may have compensated to the right exactly how he planned, allowing a redirect back toward the inside, hitting a more close to center vertical right or something of that requirement because it's clear he did not hit the cb where he was originally aiming.
They say he was one of the top 3 best in history and I have to speculate he couldnt be unless he generally hit exactly where he intended.
You decide.
https://www.youtube.com/watch?v=qgAmdlfbh1Q