Trump is a very, very bad example to work from for technique. On every shot he lines up on the right side of the ball and swerves the cue stick to the left -- we see left to right. For example, see a front view of Judd at 2:28. I think that comes from having his head in the wrong place.watch neil robertson stance
very cross eyed dominant
watch his stance and trumps not as severely cross eyed dominant but it seems the cue is to the right of his nose(trump)
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The good news is that you can be lined up with that much error and swoop across the ball on every shot and still win the World Snooker Championship. I think it's easier to improve without the swoop, though.
One thing to notice about both Robertson and Trump is essentially no elbow movement.