Um ... Sandy Koufax is one of the greatest pitchers of all time, and it's not even remotely arguable. HOF votes are based on career counting stats and five-year peak stats, and koufax's five year peak is about as great as you'll ever see. You're a good poster, but do you know enough about baseball to comment on it? Koufax had a total of 46.6 WAR between 1961 and 1966 (staggeringly great) plus two dominant postseason WS-winning performances and 5 straight ERA titles.
Christ, man: Koufax's ERA in 4 world series was 0.95 and he won 2 world series MVPs.
More to the point, Koufax did nothing until his seventh season in MLB.