He is playing against high school kids who aren't nearly as physically mature as himself. If his skillset was as developed as you let on, he wouldn't have been the 4th scoring option on his team last year.
Drummond is just another athletic big with zero fundamentals. He's riding the "Could he be the next Dwight Howard?
" wave. Simple as that. Right now people are reading way too much into his potential and too little in the likelihood he busts.