With Bobbing, as with many things in G.O.L.F., the 3rd Law applies. There must be some reaction the the Bob. One of the possible reactions is some type of Radius Adjustment. You do occasionally see some good players whose head appears to drop on the Downswing(Tiger Woods is one). The good players seem to often adjust by (leaning the shaft more forward), and another way to adjust would be to (bend the left arm), which usually doesn't work as well. Somehow the radius must match up at Impact in order to strike the ball. I got this from teaching with George Kelnhofer several years ago.
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