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Only thing I'd add: If and when a Walt Jocketty smiles about a Jack Zduriencik "being in over his head," that doesn't mean what a USSM poster assumes it means. Jocketty isn't referring to how easy it is to trade Franklin Gutierrez and Jason Vargas to Zduriencik for JJ Putz, or how easy it is for Scott Boras to sell the Mariners an expensive client.
Relating to people, forseeing land mines, maintaining coherency in a crisis, there are a lot of things that Peter Principle types run into. Few of them have much to do with whether Raul Ibanez hits 29 homers, or Michael Morse gets injured.