Sparring in an exhibition is not “making a comeback’ though Master.

just to name a few gloved heavyweight champs who boxed exhibitions after they had retired …. Sullivan, Corbett, Fitzsimmons, Jeffries, Johnson, Hart, Willard, Dempsey, Tunney, Baer, Carnera, Louis, Charles, Walcott, Ali, Holmes, Witherspoon, Dokes, Thomas, Smith, Page, Tubbs, Tyson. They didn’t count them as comebacks!