In my opinion it only "looks" like he is keeping all of his weight on his left side because of his type of pivot.
I'm not TGM pro

, but it sure looks to me like a hitter's motion with a right forearm takeaway "style" (not saying he's doing it right) because if you notice through the face on view of his swing his head is staying in the center of his feet, like Homer says in the unpublished 7th Ed...this whole idea of the tri-pod. Your head centered between your two feet.
When you do this correctly you will straighten your right leg some (which is fine), and it will look like you are almost "sagging" to the left because you don't get that new style of "leaning to the right look."
this is all explained very well in brian's video on Right forearm takeaway versus shoulder turn takeaway.
I'd love to see a driver view of him and see if he still uses the same pivot style. One thing i did notice is the doesn't have enough "down" imo because his right forearm is pretty above the plane at impact. He needs the right shoulder to be lower. Otherwise pretty solid move. I bet he's a pretty decent iron player with good accuracy.
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