OK, even a bad defensive 2B will rob a hit from time to time. It really has more to do with positioning, and that comes from scouting reports. But your notion of 5-10 seems to me to be too extreme. And again, I am not up to showing the statistical analysis to shed light on this.
Brandon Inge = Ian Kinlser defensively. Would you have Inge back over Castellanos just because the perception is he plays good defense?
What about all the bone head mistakes Kinsler has made in the field that hasn't shown as an error and even his getting picked off base?
Posters have ragged on Kelly. They have ragged on Romine. They have ragged on Castellanos. They have ragged on Avila. They have ragged on just about every pitcher not named Scherzer or Sanchez. Early in the year, they were ragging on Hunter.
Yet, since the AS break (if not longer), Ian Kinsler has been a below average offensive 2B and certainly a below average leadoff hitter. I am chastised for just mentioning that fact. Why the hypocrisy?