pecky,
I always feel that where body use is concerned, sometimes you have to listen (or abide) by what your body naturally dictates..
For example, walking...
When you walk your body instinctively knows that once the foot in the air hits the ground it needs to carry most of your weight before you lift the back foot off the ground...if it didn't you would fall over...therefore, most of your weight goes to the top of the femur bone on that leg...and if you change direction you would pivot around that point...not around your spine.
Now for the golf swing, your arms (and the weight of them and the club) move to your right...your body should naturally compensate for this by moving more weight to the top of your right femur, than if you didn't have your arms stuck out there.....and if you now wanted to change direction (pivot) you would naturally pivot around that point..not your spine.
I don't know what Brian is doing in his swing..maybe the swings you have seen involve more weight staying on the front foot...I don't know, it may just be an part of Brian's swing dynamic, ...how does it look with his driver?.....