Darrell Porter would play more seasons with Milwaukee and would win a World Series with St. Louis (where he was both the NLCS and World Series MVP) but in between those teams he played the best baseball of his career with the Kansas City Royals.
A National Champion at Arizona State Larry Gura would have mediocre stints with the Chicago Cubs and New York Yankees before the latter traded him to Kansas City. It would be in the Midwest where the southpaw would find himself as the Royals’ sometimes ace.
If we were to this list based primarily on longevity and statistical accumulation then Paul Splittorff would be near the top, however, it is hard for us to rank someone higher when he never seriously challenged for any statistical win among hurlers in any season, nor was he really considered the ace of the staff by those in the know.