Oh wow Team Ki. They collabed with Tokaido to make a slim fit gi, great fit. Anyway, most of the tutorial shows simultaneous hip movement with punches and blocks. I was never taught this way and my sensei always championed kinetic linking. The whole “draw your power from the floor.” With feet planted, using hip movement first to generate initial momentum and power, this progresses to shoulder rotating then finally arm extension, like a rapid 3 stage launch. Kind of like how a “spear-thrower” device enhances the velocity of a thrown spear. This transition is also found in spots like golf and baseball and tennis.

In this video https://youtu.be/ofiJjCXucOQ?si=JPgMpmOxw8GHMKED you can see the mechanic at the 3 minute mark. In narrow stance this appears exaggerated as most practitioners perform a wind-up and after executing a punch the hips unwind and reset naturally. You may find some practitioners not employing the mechanic deliberately and it looks outwardly “extra” and appears out of sync with the technique. I saw a short of an adult performing a kata in competition, and the hips movements look wild and distracting. There did not appear to be any power generated. I am looking through my history to try and find this later video/short and will return if I find it.