I understand the point that you are trying to make. But IMHO you're making a static analysis of an evolutionary product. I believe that the players from the 1960's and 70's, if born into today's society, would be proportionally sized to the players that they competed against in their respective eras.
But what if you transported today's players back to that era. Sans Jerry West, who had what many consider to be the perfect form on your jump shot, everyone was a 'chucker' of sorts (think George Gervin).
Many of the greatest players of that era for various reasons never played in college or professionally. When Kareem retired he was asked who was the greatest player that he ever played against? His answer: "It would have to be Goat, Earl 'the Goat' Manigault." The Goat played during the basketball revolution of New York City in the 1960s.
“The Goat” had a tough time with drugs starting with his expulsion from high school for smoking marijuana. He finished high school at Laurinburg Institute in North Carolina, averaging 31 points and 13 rebounds per game. Magnigut received recruiting letters from North Carolina, Duke, Indiana and hundreds of other college basketball programs. He ended up choosing a historically black college where he only lasted one semester. At 6’1 Magnigut had ridiculous leaping ability, he dunked on some of the NBA’s best shot blockers including Jabbar, Connie Hawkins and Willis Reed. “He reminded me a lot of David Thompson,” says Jabbar. He could really explode above the rim.”
Of course he had a signature dunk, the double dunk. He allegedly would dunk the ball, catch it with his left hand, switch it to the right hand, and jam it back through. He showcased his leaping ability by pulling dollar bills off the top of the backboard to win bets around New York. Devoted much of his jumping ability to the fact that he wore ankle weights for much of his youth. Manigault started the Goat Tournament, a summer tourney that would feature NBA stars such as Bernard King and Mario Elie. Eventually he developed a heroin addiction and faced jail time. He died in 1998 in his hometown of New York City.
How would today's players work at actually inventing the game that they have an opportunity to continue to perfect without the benefit of watching others play on TV? And what if they had to actually invent the drills that the great players from that era helped invent and that they used to become more proficient players. The Mikan Drill, the Jerry West Drill, etc.
I don't believe that there are any guys currently playing streetball in our country right now that would be able to not only play with bit dominate today's NBA players. Not true back in the day. There were players from that era who turned down professional contracts because they had more lucrative 'businesses' in their communities.
Streetball Legends documents some of the all time greats that no one has ever heard of from that era.