I always thought it was Lefty Grove who, in 1930, pitched a quadruple-crown leading MLB in Wins, ERA, Strikeputs, and Saves.
Decided to look it up in Baseball Refenence. They have pitching WAR. Grove was the best lefty at about 9% greater than Randy Johnson. Koufax didn’t make the top 20.
Grove also had a better 4-year streak than Koufax, although I don’t know why people use that as a metric
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