Koufax was remarkable, but I always considered Bob Gibson the last of the greatest pitchers of the era...
In game 6 Curt Flood discovered what happened when you misplayed a ball in center-field at old Tiger Stadium (440 feet to straight-away center).
(On the mound anyway).
Gibson was great, but there was a pitcher in ‘67 and ‘68 who led the majors in ‘67 among all players with 25 games or more in slugging average, ahead of Frank Howard, Ron Santo, Orlando Cepada, Willie McCovey, Al Kaline, Roberto Clemente, Harmon Killibrew, Dick Allen, Hank Aaron, Frank Robinson, and Carl Yasrtzemski. His team lost the pennant by one game that year.
In ‘68 the team won the World Series, the manager Manager of the Year, and the ace pitcher the Cy Young. The same pitcher led the majors among all pitchers with 25 games or more in ERA with 0.69 - 8 runs in 25 games. But not the Cy Young, as he had been traded to the National League and Gibson had his career best that year.
And the original post is incorrect in saying Koufax led the majors in ERA in 1962. Koufax led the National League, but this same pitcher led the American League and the Majors in ‘62 with 2.21 to Koufax’s 2.54. He only won 16 that year, but that was out of 22 starts. So no Cy Young votes ever for him.
And for his career, he had only 1.5 K per nine innings pitched, but 0.09 BB per nine innings pitched, for a career K/BB ratio of 16+. Hank Aguirre gets no respect.