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John, 5th Earl of Bessborough, played five games in the 1830s; Frederick, the 6th Earl, played more than 70 games between 1834 and 1856, and was a founder of both Surrey and I Zingari; while Spencer appeared over 60 times between 1841 and 1862.
His wife, Geraldine Sarah Ponsonby (d. November 29, 1944), was the granddaughter of John Ponsonby, 4th Earl of Bessborough, and the great-granddaughter of George Coventry, 8th Earl of Coventry.
Thus, if any is to blame in the short-lived 'Fitzwilliam episode' it is the great Irish politician Henry Grattan and the Ponsonby brothers - presumably William Ponsonby, later Lord Imokilly and his brother John Ponsonby—not to mention Lord Fitzwilliam himself.