Rondo takes better care of the ball than Nash or Kidd did. If they didn't have the same "questionable tendencies" that Rondo did, why did they turn the ball over more often? Inferior passing and ball-handling skills to Rondo's?
This is simply not true. Rondo and Nash are turning the ball over at approximately the same rate (2.9 for Nash, 2.7 for Rondo over approximately the same amount of minutes per game). Kidd is distinctly less turnover prone than both of them (1.9 in 36 mpg for career).
Undoubtedly, if you handle the ball a lot and are expected to make stuff happen, you'll turn it over more than, say, a spot-up shooter would. In the grand scheme of things, I don't think Rondo's propensity to make ill-advised passes is worse than, say, Pierce's propensity to take ill-advised shots at this point. But it's a real issue.
This doesn't in any way belittle the fact that rond's having a phenomenal year, but that's a different discussion altogether.