I see many fans praising Jonas domination of Under 19 basketball tournament. He deserves those praises for playing this well but let’s not kidd ourselves. This tournament is meaningless in terms of evaluating if Jonas can be a star player in the NBA. Most of those star players in the tournament couldn't hack it as starters on above average NCAA team ( I am not saying Jonas is one of them).
Wait until he plays the Men's tournament in the end of August before we can see any indication of NBA potential. The fact that he's 19 and playing this well among his age group is a good start.