Smart isn't even turning the ball over that much, Rozier has 4 Turnovers over 5 games, Smart has 6. TWO turnovers the difference.
I'll point out that Smart is averaging 2 steals per game (dont know where to get per 36 stats, even though I doubt Rozier has even played close to 36 minutes of NBA game at one time in his life), and Smart is plus minus +29, whilst Rozier is -11 over these games.
I like Rozier a lot, but I think Smart has been far and away better in almost every aspect of the preseason from watching the games.