My assumption on "one" pitcher needing to go to AAA, is being replaced by a position player. Now that Guerrier is up, two pitchers need to go to AAA, but since Guerrier is a crap shoot and Deduno can only go 4 innings they have to keep a 13th pitcher. You may be right that Gardy was frustrated as a result of Arcia aggravating his injury on the day he was supposed to be called up. Good point on Parms, either he's too valuable to risk later or he isn't valuable enough to risk losing Burton or Florimon over. I'm better latter.... Sad...