When a golfer is doing all of the above, he's aka a high handicap HACKER. He could be a beginner trying to figure things out on his own or just a struggling long time hacker who's favorite song is "I Did It My Way".
That's all very basic stuff which should have been ingrained early on by a teaching pro with a strong foundation. Grip, stance, posture, and alignment.
When things go haywire for low handicap amateurs and touring pros, sure they have enough knowledge to tweak a little something here and there, but they usually go straight to their instructor who looks at all active parts in the above. The grip, stance, posture, and alignment control everything including the elbow which could be a problem in golf also known as a "flying elbow." It gets too far away from the body and is pointing toward the rear instead of straight down.
The elbow doesn't have a mind of it's own and not the area to focus on directly in trying to alter it. In pool, just like golf, the parts to focus on are grip, stance, posture, and alignment. One or more of them need to be tweaked or altered to influence the upper arm, forearm, and hand. The elbow is just the connector, not the engine.
Lou didn't say that directly in his earlier posts but alluded to it. And he's dead on. And I'm saying it right here and now.
Whether it's golf, tennis, or pool, it amazes me how a good number of people heavily into the sports will stand there and proudly say, " Ah neva had a lesson in mah life. Ahm all self tawt and figur it out on mah own." And my thoughts are, "No SH*T...it shows."