[Yoda]

Don . . . check your buddy's neck/head at address . . . imagine he's got laser beams shooting out of his eyes . . . where would the laser shoot if it were coming straight out of his eye sockets? Good chance that he needs to tilt his head down. He could be making that move so he can see the ball.

The "adding waist bend" can be a geometric problem because it can be a disruption of the "radius" . . . if his head is lowering there are implications in the orbit of the club and some sort of compensation will manifest it self . . . raising up . . . bending left wrist . . . bending the left elbow . . . could be anything.

Look at Adam Scott's address . . . his teach has for sure told him to "keep his spine straight" . . . look at where his eyeball laser would be shooting at adress vs. four frames back from the last frame . . . clearly he has tilted his chin down . . . look at the bill of his cap in the sequence . . it moves down that telephone pole in the back. You can't hit what you can't see.

Happily, this is not a recent sequence. Saw Adam at Doral this spring, and he's DEFINITELY changed his Head position at Address. He's now looking at the ball. Also, his Start Up is On Plane (and not 'outside'). Yay!