Here's my breakdown on Anunoby's jumpshot:
He has a smooth follow through which is a good start. The biggest problem I see is his lower body mechanics are inconsistent and stiff. I think this could be because of the timing of his upper-body mechanics and lower body mechanics. It doesn't flow together. I think he brings the ball up a little to slow. This is very detrimental when he has a defender somewhat close, as he starts to jump before the ball reaches his shot pocket, as he is trying to get it off quicker.
A reason his shot is slow is because his shooting should is slumped forward, which bring the ball up far away from his body.
View attachment 13955
This takes extra time to do as the ball is moving across a bigger distance. It also slows down his jumper because his shoulder and elbow are more tense because of the shoulder slump.
Another reason for his lower body inconsistency is because he doesn't align his feet and his shoulders. This is different than squaring up. Squaring up means 10 toes towards the rim, and shoulders perfectly squared. Not aligning your hips and feet means your feet might be tilted left and shoulders square, or shoulders are tilted and feet are square.
A tilt left isn't a bad thing if hips and shoulder are aligned. Tilting your feet and shoulders to the left (thus putting your right shoulder forward) makes it so that you can align your shooting elbow with your hip and the hoop without as much tension as squaring up. Many great shooters tilt (Lillard, Curry, Durant, etc.) Here's an example of a tilt with legs and shoulders perfectly aligned.
View attachment 13956
-------------
However, Anunoby tilts his feet left but keeps his shoulders perfectly square.
View attachment 13957
This means that not only does he have more shoulder tension due to the squaring of his shoulders, but it also means that his lower body and upper body are out of alignment, due to a twist at the hips. This means that the two can't work together to get a smooth, straight flow from the ground through the ball.
If Anunoby stops slumping his shoulder forward, thus keeping the ball closer to his body when he brings it up his shotline, it will speed up his upper body naturally, thus
improving timing between his lower and upper body.
And if Anunoby tilts his shoulders left, it will align them with his feet, lessen shoulder tension, and make his
lower and upper body flow together as one, while making his base more consistent due to the elimination of hip twist.