I thought the purpose of a waggle was to rehearse a certain move in the swing. I have seen Jason Dufner several times and he certainly waggles quite a bit---almost reminds me of Sergio regripping the club a few years back. But his waggle looks nothing like his takeaway. I am a complete amateur at looking at swings so I wonder if anyone has any thoughts.
(Nice story---when Jason first won some big cash a few years ago he bought his caddy a Corvette and himself an Escalade. A guy at the Auburn University Club told me you can hear him coming from a mile away as he likes to play Rap muscic very loud.)