https://youtu.be/H5QrJGUocAo?t=86
I said this in another thread. Ronnie's elbow doesn't drop until after the cue tip has struck the cue ball. What the elbow or any other part of his body does after the cue tip has struck the cue ball is 100% meaningless. If Ronnie sprouts wings and flies around the pool hall after the cue tip strikes the cue ball it has zero impact on where the ball goes.
Part 2 of the conversation is what works for one person might not work for another person. Proof of that is how many different stances and strokes world class players have. A great example is Oliver Ortmann, world champion 9 ball and multiple world champion straight pool player. He shoots sidearm - the most exaggerated sidearm stroke I can think of in a top player - and it works for him.
In a different sport baseball I saw an interview with former MLB player Willie McGee who won a batting title and MVP. He said early in his career as soon as he reached the major leagues a coach tried to change his stance and he thanked another Cardinal coach Dave Ricketts for intervening on his behalf and telling the other coach to "leave that boy alone". He was good enough at hitting a baseball to make it to the major leagues and saw no need to change - and he was right.
Therefore Ronnie's elbow doesn't drop until after the cue tip has struck the cue ball so it doesn't matter and even if his elbow did drop earlier the balls go in the pocket so it still doesn't matter.