Well, okay, if you want to discuss the pause, then let's do that. First, I could be wrong but I think some people here are discussing the pause at the cb before the final stroke in some of their discussions, which makes things confusing to the discussion. That's a different pause. As for the pause in discussion, as long as you don't shoot with a continuous loop stroke, you will pause at the end of your back stroke. With some players, it's hardly noticeable. The length of that pause varies from player to player.I think the majority using the pause, benefit by virtue of less distortion on delivery. Just that, if they haven't developed a mental process to go along with the rhythm. If it's like wait, jerk, watch, that dun make much sense.
Speaking of instruction, I copied Gorst's delivery. Melling wasn't hot enough to copy . The ticket is slow and schmoove. It's amazing how much and how precise a force a properly actuated cue can generate.
As to why a player pauses for a certain length, here's what I've learned: For some players, that pause is their hand-eye coordinator --- meaning the pause is when they move their eyes from the cb to the ob, so they may pause a fraction longer. A longer pause also negates the effect of a poorly-timed backstroke that could negatively impact the timing of the forward motion. For example: players who tend to bring their cue back fast for every shot might be better served with a fraction longer pause at the end of their backstroke to reset the stroke. Rhythm players tend to pause the least. Their stroke timing begins with a slow backstroke that leads to a favorably-timed, continuously accelerating forward stroke, similar to throwing a pitch or a punch with a slow wind-up. I've noticed that in general, players who play this way tend to be athletic and seem to have natural good-timing.
And some players are taught to play with a longer pause, so that's how they play. I believe this is true with many snooker players who are taught that way from the start.