Locarno was written to be somewhat like a young Jim Kirk character, a charismatic risktaker who'll break rules. But rather than coming out on top like Kirk does, Locarno loses before his career had a chance to begin. It might have been interesting to see what a Kirk-type personality would be like without the success that Kirk generally had.
But I guess the Locarno/Paris idea was that Locarno was seemingly a really good guy, but deep down he was flawed. Conversely, Paris was the guy who seemed like a bad guy but really was decent and good. Take your pick.