Personally, I think if you shrunk someone like LeBron down to 6’0” they’d still make an impact on the game where on the other hand if you shrunk someone like Giannis down to 6’0” he probably wouldn’t be in the league. Is there anyone you think could still be effective in the league at a shrunken height, whether it be from 6’11” -> 6’6” or 6’6” -> 6’0”?
Shaq about 6 inches shorter is just Big Baby. A good reliable role player but not dominate at the pro level.