As is the case with most young big men, Porzingis needs to add strength and show he can handle the NBA's physical style. In all likelihood, he will remain overseas for a couple of more years while he develops. But he's a terrific draft-and-stash option and a potential first-round pick if he stays in the pool.
Like his brother, Antetokounmpo is an explosive athlete, one of the best in the D-League. He has a lot of promise defensively with his length and quickness and a tenacious attitude. He can play above the rim, but it will take a ton of skill development for him to make a real impact on offense. Expect to hear his name called in the second round, and even then there's a chance his team keeps him in the D-League longer.