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I do put some stock in being able to call a good game...but Mike Piazza was an asset to his clubs behind the plate despite calling a mediocre game and throwing out about 1 runner in 6 for most of his career. :)
I don't think Catcher Defense really has a large win-value impact on a team, all told...with the possible exception fo the catchers who are EXREMELY POOR at calling a good game and/or leading their pitchers. (Giminez, e.g.)