I've been on a bit of a defense kick lately, and I wanted to illustrate that losing Edmonds' production from last year isn't as big a blow to the team as previously thought. Last year Edmonds put up a .354 wOBA as a Cub. Using .328 as league average from a recent FanGraphs article, and Tango's formula to convert to runs, Edmonds was about 10 runs above average with the bat. UZR had his defense continuing a 4 year trend of deterioration at -10 runs. Since it was the largest jump in those 4 years, let's be conservative and say that he was actually half that bad, and say on an offense+defense basis Edmonds is +5 runs. Now for Kosuke. He finished the year with a .328 wOBA, exactly league average. Bill James projects a better season from him next season while Marcels has more of the same, let's be pessimistic and say he drops to .315. That makes him 5 runs below average with the bat given Edmonds' PAs. UZR has Kosuke as a +10 defender in RF. Since Kosuke's strength in RF is his range, I don't think that it would be overly different in CF, so let's say he's a +7 defender there next year. That puts Kosuke at +2 runs on an offense+defense basis. Three runs separating the two players is not really significant. Given that we were generous to Edmonds' defense and pessimistic to Kosuke's offense, there's reason to believe that simply inserting Kosuke instead of Edmonds into the CF platoon makes us better off as a whole next year. Also, for anyone who's curious, Pie is probably a +15 CF, and as such needs to be about a .301 wOBA to equal Edmonds at +5. To compare across statistics, Marcels projects Pie for a .310 wOBA, and a .251/.317/.389/.706 slash line.