Players like Camilo Villegas such as Byron Nelson and some Tiger Woods, Drop their Posture to the Elbow Plane to avoid the "Vertical Drop" typical of the Hogan Style Elbow Plane. This is Hands Controlled Pivot on the Elbow Plane. These Players are completely aware of their Lag Pressure and want to drive it "Straight to the Ball" and avoid the typical Plane Shift.
Thanks for the Video of Camilo Villegas HungryBear, he has awesome physical ability.
Yes, but Vegas has the elbow as close to his hip as he can @ impact. So this is not an "upper body TSP motion" on the EP.
A note about Tiger: He moves his neck down and up again, but he keeps his hips more level than most throughout the swing. The alternative is to keep the neck level and move the hips up and down and up.
When you think about where the swing center is (where the sweet spot plane meets the torso), it may not as bobby as by first sight to move the head and keep the hips level.