Which wuxia heroes, if we stripped them of their morality, had the potential to be great wuxia villains?
I sometimes think that Gu Long created Yip Goo Sing so that he could make Sai Mun Chui Sheut a villain...without actually turning Sai Mun Chui Sheut into a villain. By creating Yip Goo Sing, Gu Long essentially made an "evil twin" for Sai Mun Chui Sheut.