Carlos Zambrano played all of but his final season with the Chicago Cubs, where the Venezuelan was a three-time All-Star who also finished third in Cy Young voting five times.  In the first decade of the 2000s, Zambrano was one of the more dependable hurlers and was the only one in the NL who had at least 13 Wins from 2003 to 2008.  In 2006 he made history as the first Venezuelan to lead the National League in Wins, and he would finish in the top ten in ERA four times.

Hack Wilson was playing for Toledo of the American Association after falling into a slump with the New York Giants.  He was left unprotected (some say an oversight), and the Chicago Cubs swooped in and claimed him late in 1925.  The Giants loss was the Cubs game as Hack Wilson would win the National League Home Run crown in 1926, a feat he would repeat in 1927, 1928, and 1930.  Wilson wasn't just hitting for power as with the exception of 1931, and he never had a season where he batted under .300 or had an OBP under .400.  Wilson would twice lead the NL in Walks, and his Slash Line as a Chicago Cub is an incredible .322/.412/.590.

Playing for the Chicago White Stockings/Colts for seven seasons, Bill Hutchinson was a dominating presence for three of them, so much so that he earned this high ranking.  In each of those years (1890-92), Hutchinson would lead the National League in Wins and Innings Pitched, and he would also win the Strikeout Title in 1892 while finishing second in the other two seasons mentioned above.  After that, Hutchinson was an average Pitcher at best, playing three more seasons without doing anything special, but after it was said and done, his career at Chicago would see him win 180 Games with 1,225 Strikeouts.

Mark Grace was drafted in the 24^th Round of the 1985 Amateur Draft, and generally, when you are chosen that low, you aren't expected to do much at the Major League level.  Nobody seemed to have conveyed that to Mark Grace.