I'm not sure I agree with you guys about the inability to drastically add additional skills. We have seen guys work on the 3 point shots, midrange game, back to the basket skills, ... etc. A typical example was Hakeem Olajuwon. When he came to the league, he was a shot blocker. Later in his career he became a low post assassin. I doubt a guy like Siakam was so talented when coming out of college. But now, I can see him do things Aminu/Moe can only dream of. So, I believe guys can add these skills. His coach even recognized, he had been a gym rat.
My point is ... if Zach Collins wants to be our Draymond, ... he needs to become a gym rat and start putting in the work.