It shows the head move...doesn't prove anything really tho.
He did have more head movement back then too. (and he did do OK)
Yeah, I answer to M-dog. Watching this clip is disorientating, and I think it illustrates the amount of compensation necessary by the motor system in order to strike solid golf shots with head movement. Yeah, I'm sure he hit it extremely well. The question is whether the average player is giving up consistency by moving the head. For me personally, this clip is enough for me to try and keep my head as still as possible and feel that I have eliminated one element from my swing that can go wrong.
Certainly for another person this clip will not mean the same as it does to me, I think that's perfectly reasonable. That's the beauty of golf, with a lot of study and work we can design a golf swing that we feel makes sense and hopefully produces excellent results, head movement or not.
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"In my experience, if you stay with the essentials you WILL build a repeatable swing undoubtedly. If you can master the Imperatives you have a champion" (Vikram).
The reason you can't sustain the lag is because you are so eager to make the club move fast (a reaction to the intent of "hitting it far"). So on a full shot you throw it away too early, which doesn't happen for your short chip. (bts)