Re: The Continuity and Serialization of Voyager
Maybe Ergin had a heavy accent or something. Or maybe giving him any significant dialogue in one episode would have made him more expensive for later episodes, the way the union rules work.
Or perhaps, as happened with Eddie Paskey, he'd just get too stressed out having to do significant dialogue on screen.
Dr. Howard, Dr. Fine, Dr. Howard: For duty and humanity! --Men in Black (1934)