Just was thinking about this subject - actors, actresses, directors and composers who did something great in the genre, and should have done more, but for whatever reason did not. Who makes your list?
My first thought after re-watching “The Mercenary” today is Tony Musante. He is absolutely terrific in a somewhat Milian-esque role as Paco. How did this guy not appear in a string of spaghetti westerns? Looking over his filmography, this was apparently the only one - what a shame.