BTW, on the 3 point thing. In 08/09 the Thunder as a team shot 11.6 3's per game. Green's 3.2 attempts led the team (just ahead of Durant and well ahead of 3rd) and comprised over 27.5% of the total attempts. Boston this year attempts 31.4 3's a game. Brown's 4.6 is nearly 2 attempts lower than Irving, is tied with Smart, and barely ahead of Rozier. That 4.6 is less than 15% of the total 3's attempted by the team.
In other words, Green was a far more active and important 3 point shooter than Brown is, despite Brown taking more attempts. So yeah, not the best comparison, but not at all for the reason you think it is. The league was just a different beast back then when it comes to the 3 ball. And as I said in my last post, both Green and Brown took the 2nd most shots on the team and were the 2nd leading scorers.
40% of Jaylen's shots this year are threes. That's a much higher rate than Green has ever approached in his career. Green's career high is 34.6%, and that was last season.
I would appreciate your "changing league" argument more if Green's perimeter attempts had increased over time, but this hasn't been the case to the degree that one would expect if Green really were a similar kind of player in a similar kind of role to Brown.
Jaylen's shot profile through 2 seasons marks him as a wing player, and in year two he's already an above average 3 point shooter despite entering the league with a reputation as a player with poor range.
Green was always a tweener who seemed to have the potential to become more of a perimeter player ("top 5 SF"), but never developed the consistent outside shot or the shot profile of that kind of player.
I will acknowledge that Brown and Green have similarities. I just don't agree that Green is the best comparison here, as you have suggested. There are other players who entered the league at a more similar age and played a more similar role from the get-go whose stats are more relevant and comparable. Those players are by and large guards and wings. Not all of them have gone on to anything like stardom; some have not even, to date, established themselves as useful rotation players.