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Ok so rather than be on the ball of his foot he's rising onto his toes for height rather than rotation. Is that what you're getting at?
Not everyone is the same or has the same habits... kinda getting caught in the minutia... but if you have giant padded gloves, it helps to avoid breaking your 4/5 metacarpals. Plus, your forearm has a LOT of flexor groups to help stabilize the wrist (flexing is waving bye downwards). Only a few weaker muscles adduct and abduct the wrist and keep it stable (palm down, left/right motion). Flexors also work with the biceps. Biceps brachii action naturally turns the palm "facing up". Try it on yourself.
And if you want to consider speed and power in relation to the base, sit on a spinning chair and hold your arms out, then bring them in. Arms out, slower, arms in, faster. If you have a wide base, you can extend your arm for more torque (first step in a hook), and then when you flex your biceps and bring the arm closer to the body (finish the punch), what happens? Just like in the chair, you start to rotate faster. So you want that initial torque with a stronger base to involve more hips and get the motion going, and then tighten the punch up.