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

As ive said before,back leg is your distance, thats where you generate force. Front leg is direction, if the heel is on the floor you cant direct,plus a lot of power is going down through the heel, not the fist.

Are you talking about a snap or push? Are you suggesting that he wouldn't have had the efficacy had his heel been flat?

Your heel is your bio mechanical brake.

Does this apply to other punches like the uppercut? Elevate the lead heel before throwing the uppercut? This goes against everything that I've been taught.