That would depend a bit on things like offense IQ, FT rating and other scoring threats on the team. Assuming a senior level IQ (A- or higher), if you don't have a standout scoring option and the kid has a good FT rating, I'd try and get him 20ish percent on the Off%. On the other hand, if you have a solid person for him to pass to, I'd bump that down (maybe 12-13ish? I still want him getting fouled regularly), let his high pass rating make the other guys better and take the fouls and defensive points that the guy's awesome Ath/Spd combo will inevitably rack up (especially if you're a press team).
And if the decision is too much, feel free to send him to my D2 team...I'll find room for him if he can play defense ;)