You are talking about mental aptitude iq. Basketball iq can be and is taught. You aren't born with it, then walk out on the court and make it happen. Problem is, if a player is 20, but hasn't been taught how to play the game, its too late to change habits for most.
I've coached 100's of kids, do 3 camps a year, and been on a travel team staff that sent over 20 kids to D1 schools in a 3 yr span. You stating that a basketball players mind and iq can't be changed is ridiculous. Does every player that ever played for former lipscomb coach Meyer have a great iq and playing the game is natural? Hell no. He's a great teacher of the game. His players iq's on the court wouldn't be the same if they played for john pelfrey.
And by the way, Shaq did and does not have a low ball IQ. I don't know what would make you come to that conclusion. He was one of the best big man passers in the game and you don't understand cutting, angles, position and passing if you have a low ball iq.