Not sure what more you want from a 19 yo NBA rookie. 15/7.5 in 30 mpg is top notch rookie offense at the center position. As one of the few offensive threats Philly had to offer, JO wasn't ignored by defenses. He is 6'11", 275 and won't turn 21 till mid-December. His body strength isn't close to where it will be 5 years from now. He is about as sure a predictable future perennial 20/10 guy as you could possibly be.
And judging a 19/20 yo for defense against full-grown men is a bit unfair and premature to presume he won't improve. Regarding character, Coach K was glowing in praise for him and it's at least possible if not likely that CBS would be great for his development as a player and as a person.
He is absolutely, at this moment in time, more of a sure thing than any of the top 5 prospects in this draft including Simmons and Ingram.
Danny knows way better than me, so if he pulls the trigger for Okafor, I'll be all in.