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Because it's never existed, never anywhere near existed...
Not only do you have the five stoppers, you apparently now have a solid 6, and you have a legitimate three-four SP's on the farm who threaten to make top-100 lists... just sick...
Your preference to trade Vargas is, it seems, Geoff Baker's also. On Live!, he's talked about Fister being a clear playoff choice over Vargas.
Also, isn't Vargas a year closer to FA than Fister?