Should he do so , Mundine would not only become one of the few athletes to have reached the top in more than one sport .
Should he do so , Mundine would not only would also join the rare group of boxers to have successfully switched weight divisions .
Should he do so , Mundine would not only become one of the few athletes to have reached the top in more than one sport , but would also join the rare group of boxers to have successfully switched weight divisions .