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The Beane deserves a lot of respect for his continuing stream of awesome, but this seems like one of his first major deadline trades since something like Jermaine Dye? Or the subtraction of Matt Holiday? Neither of which had much impact positively for the A's in the playoff picture.
So, in conclusion, I say wait & see. I can see Shark and Hammel turning into pumpkins in the AL. But I can also see Beane turning around and trading one or both later this season (or in the offseason) too.