Should there be any attention given to the feet and lower legs as a platform or base? Do they "give" and accept the downstroke acceleration or is there a "resistance?"
Hitting or Swinging, the Knees and Feet are your stabilizing Anchors to the Ground. The Legs exert a 90 degree ('normal') force on the ground. And vice versa.
To get an idea of how important the ground is, imagine stepping off the side of an unsecured rowboat onto a dock some distance away. If in the Golf Stroke the ground acted the same way as the boat, there would be big trouble!
If you have not already provided it in the previous post, maybe we will in time have the opportunity to hear the dialogue in your "Right foream/hole'ies & Pole'ies" clip. The drill there as it is understood has been most helpful. If only it had come as a "free gift" with the book. For me and my level of understanding, I feel a difference between Hit and Swingin the "base" established with the feet. For now, I am not able to formulate a more specific question and will stay tuned in.