Nobody is giving you a real answer but it’s genetics. Families in pro sports usually excel at certain things while remaining vulnerable at others. Look at seth curry. Good/great 3pt shooter just like his bro, but just not as good. But they both made the nba. Look at the giannis bros. They’re on the same team and also play the same way, but giannis is way better.

Also clout, I doubt giannis brother makes the nba without giannis’ influence.