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Nothing really to do with Kansas City, but I wanted to see the career leaders in wOBA, the best stat in THE HISTORY OF WHATEVER! I think the only one of these players to play for a Kansas City team is "Sliding" Billy Hamilton, who broke into the bigs as a 22 year old rookie with the 1888 American Association Kansas City Cowboys. He played for KC again in 1889. He's featured in the lower right of the blog header above.
It turns out Babe Ruth was pretty good.