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As for J. Cantillion, he is identified as Jimmy Cantillon from Janesville, WI in the article, while Joe Cantillon (manager for Washington in 1907, 1908 and 1909) is also identified as from Janesville, WI. So maybe a brother? Joe played for Terre Haute in 1890. There was also a William D. Cantillon from Janesville who played in 1877 (for Janesville) and 1879 (per Baseball Reference), and a T. Cantillon with Janesville in 1877. Looks like the Cantillon family was a bunch of ball playing brothers.