Much has been made of the notion that despite being a very, very good swordsman, Sai Mun Chui Sheut from the LUK SIU FUNG stories probably did not reach the pinnacles of sword mastery that Yin 13 or Tse Hiu Fung did in Gu Long's own universe (because of the relative ways their swordsmanship abilities were described) or Jin Yong's sword elites such as Dook Goo Kau Bai and Fung Ching Yeung.
We know what Sai Mun Chui Sheut's physical limitations were and whom in the LUK SIU FUNG world he was not capable of defeating. That being said, would you say that he understood the underlying philosophy of the sword as well as a Tse Hiu Fung or a Dook Goo Kau Bai? Sai Mun Chui Sheut's discussion with Yip Goo Sing as he berated Yip for attempting to assassinate the emperor seems to indicate that this was the case.