I can't stand his jump shot, but I can't argue he has by far the best indicators of those 3.
I'm still not sure how to weigh form. Some people say good form is a reason why a guy can shoot, some say bad for is why he can improve, and I'm definitely not convinced we even know what good form is (if it exists) in detail. For me, I feel most comfortable not weighing it much until someone can demonstrate how it's been useful over a larger sample size.