It is to some extent as players are easier to replace at one end of the spectrum than the other. Based on contribution to the defense it may not be. It depends on what you mean by valuable. I have also seen a modified defensive spectrum where the 3B and CF are flipped which also makes sense to me. We don't see to many CF shifted to 3B or I guess 3B shifted to CF. DH--1B--LF--RF--3B--CF--2B--SS DH--1B--LF--RF--CF--3B--2B--SS I know it is wiki but here are a few other interesting points. The bolded line is why I want Weeks extended and am not to excited about the Hart extension. It is also why Fielder, despite his bat, shouldn't be to big of a loss.