I really don't understand much of this. First, how can team fielding that steals 1.3 hits a game make much difference over the long haul of a season, especially if having a weaker offense might cost you two hits or more per game? Second, are there other hit-robbing plays that don't show up as plus plays?
Based on total chances in 1987, Garry Templeton made 5.2 plays per game, and is WIS rated for range at A. Ozzie Smith made 5.1 PPG and is rated B+. Barry Larkin made .539 PPG and is rated C and Craig Reynolds made 4.4 PPG and is rated D-. So, does the difference of making only an additional 0.8 PPG merit the difference between having A range and having D- range? If not, then what else is being considered in range ratings -- and how would anything other than chances handled bear on one's range rating?