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Basically you could get Hudson+Liriano for about a net of $4mil more than just keeping Lopez (if Lopez for Liriano staightup was really doable).
The Twins could do exactly the same if they didn't trade Liriano, which makes me believe that this trade is pretty unrealisitic. It'll be Lopez+ for Liriano IMO, and depending on the + thats still a move I'm in favor of.