Apparently you missed the "I have no idea" part of my post. Honestly I don't follow other teams minor league prospects to know whats out there.
I disagree w/ moving CoJack though, he's defense is a mess, but so is Tracy's. Defense is more important at 3rd base, and I think CoJack has a higher ceiling than Tracy (who I think is probably peaked).
I'll probably catch hell for this, but if I was the Dbacks management, I'd listen to trade offers for Hudson. Callaspo could man second (though not nearly as good defensively) and could be decent at the plate. Hudson, a gold glove winner who his hitting great last season and this, is one of the view pieces the Dbacks have that other teams covet (outside of their untouchable prospects). If the Dbacks could get some power (but not garbage like Glaus or Sexton) for Hudson, I'd seriously entertain the idea.