Baseballdad1228, this is a discussion on mechanics, not a critique of the hitter. No one is implying that Will Clark was not a great hitter, just discussing the way he swings the bat.
My two cents are that you don't see weight-shifters like him any more (maybe Sean Casey?), and it's for the better. For every Will Clark, there were hundreds of guys who were held back trying to "shift into their firm front side" and all the other Lau stuff taught in the 80's and early 90's. That move makes it harder to swing the bat and does not supply more power.
The easiest way is to keep the center of gravity in place and rotate, not shift it forward.