I think it's highly unlikely that taking a jump shot, even if you dribble the ball a few times first, is anywhere near as likely to produce a turnover as a pass.
Well - Consider that Rondo, who is, I would guess, 90% of the time not even guarded by the opposing team on offense .... has more to room pass, to see, drive, shoot, whatever.
Compare that to Westbrook, it's not like when he "dribbles the ball a few times", he has nearly the room to do it that Rondo does. It's not easy to dribble the ball and get around your defender to create space for yourself...it is absolutely susceptible to creating turnovers.
I think the amount of space Rondo gets (because of his inability to shoot) negates any sort of advantage in the turnover department that Westbrook gets because he scores more.