If you think about it, Asura could have actually worked well in a Hildibrand story (multiple faces of differing expressions: angry, sad and serene. Give them their own personality and own goals and you kinda have a three stooges situation... but in control of one body with six arms and three faces). If she were summoned earlier, we could have gotten someone who could potentially argue with herself and her battle mechanics reflecting that + changing depending on which face is currently in control (instead of being basic dungeon boss mechanics we've seen throughout EW. She doesn't do anything new or interesting).
