I think Wiggins and Smart are the two rookies most ready to play winning basketball next season.
Smart and Wiggins a bit different. Wiggins will make less positive plays but also less negative ones and be positive overall contributor. Smart make more winning plays but a lot more losing ones too (shot selection, turnovers). Both guys should be positive contributors overall thought and capable of playing big minutes (as 4th/5th best guys on team) on playoff teams, I reckon.
They are the only two guys I see as capable of starting and helping playoff team next season from lottery selections. Due to physical talent, defensive ability, two way players with strong rebounding.