Re the Neal McCoy "Shake" vid, watching each group's feet, I noticed how off VK is. Her feet are consistently ahead of the beat--her starts and finishes (such as she ever actually finishes a move) are off.
I'm not a trained dancer; I just do dance-type classes for exercise. It makes me nuts when instructors rush the beat. I hate being off-beat. If I focus on those who are off-beat, I go off-beat too, so if I can't watch the instructor because they're off-beat and don't know the patterns well enough to do it without watching, it ain't no fun at all.