I really wonder if some of these guys in their late teens and early 20s that experience late growth spurts are being helped by HGH. Like most things in sports, it's impossible to know which I personally find frustrating and dispiriting. Giannis is a good example. He's not only grown taller since he came into the league, he's also put on lots of muscle (look at him next to his own teammates like Middleton or Henson who are about the same height). My default assumption is just good genes and a good work ethic, but the past few years have taught me that this assumption isn't worth much.
It'd be neat if Tatum grew an extra inch, but even if he doesn't, the sky is the limit for this kid. His limbs are ridiculously long and he plays much bigger than his height. His floor is as a career 20ppg scorer for the next 15 years.