If I was a bit better equipped with editing tools I would have drawn an arrow from Hogans right shoulder down to his right hand.
During a major part of the down stroke Hogan's right shoulder is very close to being on the same plane as the hand path. Thus, he can thrust his hands through the path (or keep them there) by drive loading or extencior action.
TGM emphasise the right threeceps as THE muscle that operates the drive loading or extencior action. Personally I believe that there is a litte more involved, but I don't think the geometrical relationship betwen Hogan's left hand and shoulder is a coincidence. A straight push will help him hold the hand path.
As we saw in the picture in my post above, Hogan's shoulder path crosses over to the outside of the hand path towards and past impact. It's a physical fact that when club picks up speed it will impose a centrifugal force on the hands that will tend to push the hands outside their path. This is very evident in Ricky Fowler's low point position, but not so with Hogan. He holds the form exceptionally well through impact. When his right shoulder gets outside the hand path, his pushing with the right tricep will to a certain extent oppose the tendency of clubhead inertia to pull the hands outside the plane - and still drive the hands down their path.
Hogan's hand path is outside-in past impact in spite of CF trying to throw the hands out. THis means that Hogan's application of force around impact and past impace is even more outside-in than the hand path shows.
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