Well, with that height, those initial inside skills are plenty good to train. Single position training this guy will go quite fast, and even though he's 19, you could probably cap him relatively quickly.
Perhaps more of a question is where his secondary skills start. The big issue with the 7'4" gigantor type players is that they often get a full suite of atrocious and pitifil outside skills. Those skills are still useful for centers to have, especially handling, passing and outside defense. Handling and jumpshot can be trained using 1v1 forwards, but fixing low passing and low OD is usually tough with these guys.