It's been observed that Mo Yung F'uk never reached true Elite status among the martial artists of DGSD because he had practiced too many diverse techniques without focusing on one, and his internal power was not comparable to that of Kiu Fung or Kau Mor Tze.
The Golden Wheel Monk made the same observation about the pre-Heavy Iron Sword Yeung Gor during ROCH.
If we were to take peak Mo Yung F'uk and pit him against peak pre-Heavy Iron Sword Yeung Gor, which one would prevail?