I certainly do. If he doesn't push back, how does his head stay centered? How does he turn the momentum from the back leg drive, into rotation? It's a push back in the absolute physics sense, not necessarily a conscious thought.
His leg lands bent and then straightens, do you agree? Due to geometry, physics and bio-mechanics, that straightening creates a push into the pelvis. How does his pelvis get turned so that his belly-button faces the pitcher, if there is no force pushing the front hip out and back?
I have to go to practice but...
If the rear hip is moving forward and the lead hip is off of its center line, so it doesn't slide forward. Which way will the front hip move? Will it move the opposite direction of the rear hip? So, Right handed batter. If I stand in the box with my toes of my right foot facing the plate. Now I stand on my back leg only. Left leg in a flamingo pose. Now pivot your right hip around on top of the rear leg. So your belly button faces the pitcher without moving your foot. Which way did the front hip move?
Now, do the in the context of a swing. The torso is pivoting around the rear femur. The rear femur maybe moving forward. So, now the rear hip is moving forward while pivoting around the femur. That is why Bonds front hip doesn't seem to move back as far as the rear hip moves forward.
I may be wrong with the femur stuff. I think that is what that bone is called.
That is how I see the hips working. The lead leg is keeping you from falling forward. It is supplying enough pressure to catch the swing. If that is the push back you are talking about then we are good and on the same page.