Have you ever watched Hawkins shoot. I know you are an expert but this is not correct. Ray Allen released it at the top of his jump. The motion starts on the way up. Just look at the film.
I need to stop biting on these, but we can all learn about jump shooting. It's a fun topic.
TL;DR: Ray Allen doesn't shoot wrong, we just teach people different nowadays. The focus isn't on elevation and releasing at the apex of the shot. We focus more on having a small, compact and consistent leg drive that impacts the flight of the ball the same way every shot instead of "jumping higher" to shoot at longer ranges. Modern players shoot more accurately overall from range because they have a much smoother transition from the legs to the arms.
I wish I could claim to be an expert, but I'm far from it; I just listen to those who know better than me. If it makes you feel better I was keyed into this first from one of our current assistant coaches a decade ago. I wouldn't even say you're "wrong" because there are great players who release at the apex of the shot still. And at the end of the day, we're talking about milliseconds of difference between apex/before/after. Where you go wrong is thinking it's a requirement to shoot at the apex, or that Ray Allen is a paragon of shooting form currently in the game of basketball. Heck, I shoot at the apex of my shot and I'm the best jump shooter on this message board.
I never said Ray Allen or Hawkins shoots wrong, because they don't. Hawkins actually has better timing on his shot than Ray by modern standards. Ray's shot is just an old school way of shooting that you wouldn't use with someone building a shot from the ground up (like Jackson needs). My philosophy has always been "if the shot has enough arc and has consistent mechanics from toes to fingertips, it doesn't really matter what it looks like." Coaches focus more on having consistent and smooth form so you get the power of the legs into the shot instead of using them to get HIGHER UP like they did in the old days.
An example of modern shooting having less jump and a different type of power generation.... Compare Ray Allen
here actually shooting on the way DOWN after a high jump versus Klay
here releasing on the way up with way less elevation. That doesn't even include
Steph who practically doesn't leave the floor on his 3s sometimes. I think you can see after looking at the video that Ray's legs don't actually impact the shot much because he releases at the apex and the ball leaves his fingertips just after he starts going down.
It's week 1 of high school physics. When you're at the apex of a jump, what happens? You stop momentarily. That means nothing is propelling the ball forward and up towards the hoop except for Ray's arms. This was true for a lot of old school shooters. Modern shooters focus on a more compact leg drive that impacts the propulsion of the ball forward. And by having a small, consistent leg drive, it limits the variables of the shot so they only need to concern themselves with the upper body in order to adjust for range.
Back in the day when I was learning, the common practice was to jump high and focus on releasing your shot at the top. This was more important in the days when we took a lot of mid-range because you need to elevate over very close defenders. Guys with a great mid-range shot like Booker still elevate a lot when they pull up in the mid-range to reach over a defender, but when shooting 3s rely on a more modern form. Nowadays with the proliferation of 3s, the focus has been more on having a FAST shot. Steph Curry really revolutionized the game in that way and you've seen hoopers of all ages adapt their shot because of him.
Look closely at Steph, Klay, Booker, Tatum. Shoot even the bigs like Joker or Embiid. None of them elevates the way we saw MJ, Allen or Kobe do. To be fair, some freaks like Klay can actually shoot both ways because they're just that good.