[12 piece bucket]

Follow Homer Kelley's advice with regards to the Foot Action Component (7-17). The loading (Weight) can shift to the inner edge of the Foot, but it shouldn't roll the Foot over on its edged. To the extent the Heel comes off the ground, it should be pulled off, not lifted off.

I see no reason for the exaggerated drag of the Right Foot through Impact, nor the excessive Knee Action which causes it. This conclusion comes despite the fact that three great champions come to mind that use the technique: Billy Casper, George Knudsen and Larry Nelson.

Of the names you mention above, including the three company owners, I do not recall any that drag the Right Foot as promoted by the training device.

Finally, I have not seen Greg Norman's Foot Action in several years, but from the video you have supplied, I can see that the Leaderboard training aid does not produce the Foot Action he used in his early years on TOUR.

One image that has been helpful to me has been to imagine that the shin bones are springs . . . saw this in 7 Laws of the Golf Swing while parusing in the library (yes I said library).

The image of the "shin springs" was to compress the springs down into the ground at Top and Start Down by feeling as if your center of gravity moves down as well as forward . . . eliminating crazy knees and the right heel popping up prematurely . . . ala Sam Sneed Squat.