Front foot planted or front heel elevated?

[BCBUD]

Here's the clip notice the back leg in particular but most importantly the body going forward. Of interest is the following... Exhibit A. The rear leg isn't aligned the coccyx. Exhibit B. Elbow and knee connection classic Joe Frazier a hook could've easily been thrown.
Enter in exhibit C. The rear heel is aligned with lead heel rotating the right shoulder forward then the hip rotates finally adding the power of the foot. Isn't this Joe Frazier? So scrap has determined that power comes from the back which is correct. But where is the balance is it on the front leg or the back leg?https://m.youtube.com/watch?v=pC6vRJsBZEg