Re: Defensive Metrics
Using WAR, Dunn's bat was worth 56 marginal runs above replacement (36 above average and the difference between average and replacement is roughly 20) last season. A replacement level bat was worth 0 marginal runs but hidden in the value was the difference between the marginal run bar and zero which is about 57 additional runs given Dunn's playing time (i.e. those are the runs Dunn produced that one would expect any freely available bat to produce on average).
So his total offense was worth about 110 to 115 runs.
UZR suggests his defense was last year was worth -36 runs (clearly UZR graded him as giving up more than 25 total bases last season-Dewan's agrees with UZR).
So his defense in this scenario would reduce his overall marginal value by 64% and his overall production by 30%.
Assuming his career UZR as a corner outfielder is more reflective of his true skill (-15), given an offensive year like he had last season, his glove would decrease his marginal value by roughly 30% and his overall value by roughly 15%.
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