I thought we were talking about defense, not some combination of offense/defense/leadership/morale, etc..
Talking about defense and assuming the other factors are the same. According to article at FanGraphs, a great defensive SS will save you about 15 runs compared to an average defensive SS. A poor defensive SS will cost you about 15 runs compared to an average defensive SS. So the difference between a great defensive SS and a poor defensive SS is about 30 runs, not taking in account their offense, etc..
Bottom line, if you have a poor defensive SS, he better hit pretty darn good or you better be looking for a replacement.
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