Your not wrong as long as that elbow drop happens post contact and not pre like it does for me lol
Michael Holt did an interesting YT video on cue action (smashing in long blues with deep screw and then waving his cue around like a magic wand).
The point was, what happens after you've contacted the CB and put all the impetus in a straight line through the ball, means nothing. It doesn't matter at all what happens to your body. You could do the Macarena after every shot, as long as the contact point was where it needed to be and was driving momentum in a straight line.
As for elbow drop, It was definitely frowned upon when I was growing up playing snooker. I personally don't see how an elbow drop prior to contact would give the necessary accurate forward momentum. After contact, it's irrelevant. So I would say pendulum is the more appropriate method, or the mechanics that I would suggest offer the greatest probability of playing well.
Short version of how a snooker coach will rabbit on in your ear...
- align the shot (foot, hip, shoulder, elbow of cueing arm) with the desired line of travel
- when down on the stroke check the alignment of the cue, and stand up again if it's feeling off, it should feel like everything marries up with the line of intended travel i.e. the parallel of foot, hip, shoulder, elbow you just made (hand, elbow, shoulder of forehand aligning with back arm - HIGH elbow - cue locked under chin running alongside body)
- from this point the only thing swinging is that elbow joint (frozen shoulder)
- point of delivery/contact (pendulum of elbow only, lose grip (mine is middle/ring finger balance point) there is some level of acceptable 'play' in the wrist for generating power, stun, spin)
I'll try to find the video, because watching him bash them in and waving his cue around like a lightsabre is pretty entertaining. He seems a bit of a cocky dude, and has an annoying northern accent, but his content is pretty good.