Adarq:
The third image in the first set of stills you posted Tdub's feet are about 80 degrees + of basket, spine is at a similar angle.
In the next image, he rotates clockwise. Can you not see that? Cuz I mean, he clearly twists to the left, when I'd expect an RL planter to twist + to the right.
$ICK3NIN.V3ND3TTA -
You are incorrect about one thing in you last post: the angle at which TDUB is planted in relation to the rim should not matter. In his other dunks he may even be 180degrees + of the rim. SUch as in the second set of stills Adarq posted, his toes are basically 180 + of the tim (not - because approached 180 from rotating +) and in that dunk he did not rotate much since he did a completely dif dunk.
Adarq's feet face the rim, but he comes from a slanted approach like most LR dunkers, so he is rotating a little bit, the rotation you'e talking abotu though is happening after the jump, and it's compltely opposite of how others think to jump: RL planters would rotate opposite of Tdub for instance.
Also I'd imagine this coiling exercise would feel a lot like a simple 2 punch in boxing, where your back fist rotates across your entire body, and beginners would definitely feel this in your core.
THe motion is quite similar, squat back, rotate left, feet are in an RL plant right foot back, punch with right.