Cameron Reddish, R. J. Barrett and Zion Williamson are all incoming freshmen at Duke this season, and we may see them as one-and-dones taken in the top-5 of the 2019 NBA draft.
Zion is the wild card here. No one frankly has a good handle on him or how (or where) he will fit in the modern NBA. The same was said of Charles Barkley, and he certainly had a fine and complete (excepting a Title) career. Williamson is currently listed at 6'7" and a whopping 285 pounds.