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Once the defensive-chance spheres overlap to a significant degree you're just wasting space out there. Cameron used to run all the way to where the LF was standing, basically, to make plays.
I definitely jump at the chance to put Brooks Robinson at 3B and Ozzie Smith at SS -- but I don't get to add their defensive impacts together. The W's and L's won't work out that way.
A ball slices into Death Valley at Safeco, the CF of course catches it, but a fast LF would have caught it too...