It would also be true of Sandy Koufax who never played baseball at all till he went to college on a basketball scholarship if you know his story. I remember the 1963 World Series very well.
i don’t know where you got your information. Koufax played high school baseball. He was better at basketball. He started college on a basketball scholarship and walked on for baseball. This was before overlap in college sports seasons and year round training.
In his one year of college ball Koufax struck out 50 in 32 innings with his 93 mph fastball. Throwing 93 in the 50’s was really bringing it. Throwing that hard was what made his vicious curve so effective.