I personally do not believe that a small mount of head-dropping will affect Tiger's swing as long as the upper swing center (blue dot area) remains stationary during the torso's rotational movement. If one conceives of the upper swing center as being a 8-12" cubic-shaped area within Tiger's torso - located centrally between the shoulder sockets and located in front of the upper thoracic spine - then if that upper swing center remains stationary (doesn't bob up-or-down, and doesn't sway left-to-right) during the swing, then it acts like HK's "SOME POINT on the body kept stationary throughout the Stroke, to stabilize the motion.". That's my personal idea of a pivot stabilising point that allows the torso's rotational movement and the arm swinging movement to be stabilised. However, there is no biomechanical imperative to have the pivot stabilising point perfectly centralised between the feet. I think that it will be perfectly centralised in a S&T swing style - like Badd's new swing style. However, it will be slightly left-centralised (slightly left-of-center) in a swing style like VJ Trolio's driver swing style and it will be slightly right-centralised (slightly right-of-center) in a swing style like Tiger Woods driver swing style.
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