The fantasy baseball world waits impatiently for the arrivals of Anthony Rizzo and Wil Myers.  Some owners have been stashing one or the other on their rosters for months now, as folks like me keep spewing lines like “arrival is imminent” — whatever that means.  Truth is, these call-ups are utterly unpredictable.  They’re based more on opportunity than readiness, and “opportunity”, it seems, is defined differently by every GM in baseball.  Both Jed Hoyer and Dayton Moore are claiming patient approaches with their prospects, hinting that we won’t see either player in the majors this year.  But who can believe these guys?  Rizzo and Myers have combined for 55 homers on the season, and I’d love to see them join Trout and Harper in MLB’s 2012 prospect party.  When that might happen, though, is tough to gauge.  Until then, arrival is imminent.