well the cubs have retired the numbers of 5 of the top 7 players (in WAR) in franchise history. #1 was cap anson, who played a thousand years ago and who also happened to be one of the top players in the game in BARR (Bigotry Above Replacement Racist). #6 was sammy sosa, and we all know that story. mark grace checks in at #16, behind such luminaries as rick reuschel, clark griffith and carlos zambrano. so i'd say that grace's number is not too likely to be retired.