After his 23-5 season in 2002, Barry Zito has been good but not great; and the gargantuan seven-year, $126 million contract he signed before last season advertises more what he isn’t than what he is. He pitched well in an exhibition game Friday for the San Francisco Giants, but Zito’s ghastly spring training has left Giants fans thinking that although one Barry (Bonds) is gone, their other Barry is missing.