I couldn't agree with you more. Keegan will drive you crazy if you let him. He steps up to the ball, then backs off, this goes on 3 or 4 times. You want to tell him (JUST HIT THE STUPID BALL) lol
Jason Dufner's Waggle - Page 3
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I don't know for sure but considering that Jason is one of the best ball strikers, I believe this waggle is simply a reminder to keep his wrists and forearms relaxed during the swing so that he can create the great lag he is known for. It doesn't look like his actual swing because he isn't trying to emulate any particular swing movement.