You wrote-: "a "loaded" shaft helping in resisting the additionnal deceleration caused by impact of ball."
It is my opinion that a "loaded shaft" has no effect on the magnitude of clubhead deceleration due to ball collision. See nm golfers' post.
I agree that forward shaft lean at impact delofts the club. However, in my question - I stated that one should presume that clubhead speed, clubhead mass, and clubface conditions at impact should be the same for the three golfers. That would allow one to determine whether "clubhead lag" alone would affect the clubhead's magnitude of deceleration due to ball collision. I know of no reason why it should have any effect - compared to a clubhead that impacts the ball without lag.
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