I think Robert Garrigus is a pretty good of example of someone being on the opposite side of float-loading.
- Look at Garrigus' swing here: http://www.youtube.com/watch?v=HqAlB-JcApw
- Now check out Dufner's swing here: http://www.youtube.com/watch?v=l55LB8oABvQ
To really notice the big difference, look at how much more shoulder turn Dufner has than Garrigus at the middle of his backswing; Dufner already has a substantial shoulder turn when the club gets parallel to the ground, whereas Garrigus hasn't even gotten his shoulders to 45° at this point. This is because Dufner's clubhead "floats" back to the top of his swing from the pulling force of his shoulder turn; however, Garrigus pulls the club back more with his arms, and his shoulders kinda play catchup and turn in response to his arms taking the club back behind him.
In my opinion, Dufner's move promotes a more consistent impact position because he is swinging with his big muscles instead of his small muscles. Arms can be timed perfectly, but it's hard to do that on a regular basis.