Carlos even though a very sporty person:- flexible, fit and quite explosive had a rather non athletic posture. His weight was very much back on his heels, legs pretty straight and narrow stanced. The combination of his posture and grip really impeded the movement of the club head.
The club would tend to get rather off balance behind him with a closed clubface. From there in completing the backswing the club was lifted up by the arms producing a long and crossed look at the top.To get the club down Carlos would hang back on his right side needing to produce a lot of hand action to square up the club face.
After a grip and posture change Carlos’s mission is to get the clubhead working a little faster and more in balance, his new grip plays a big part in allowing him to do this. His new posture gives him a much stronger and dynamic look, from this position he is now able to engage his core muscles to also get the club moving along with a greater coiling/ winding body motion up to the top of the backswing.