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Theres no way 2.6 WAR is a worst-case scenario. IMO its a slight upside scenario since you're asking him to hit 20-25 HRs again with average D.
Danks' 2.7 WAR in SAFECO? Now THAT is a worse case scenario. A lefty flyball pitcher like him has a chance to look like Felix in Safeco with ort D. He could be worth 6+ WAR for us. Lopez just doesn't have that upside.
Lopez hasn't had a 3 WAR seasib yet, Danks went 5+ in a bandbox in the AL.
The White Sox aren't taking that deal.