In terms of martial arts, Hui Juk might have been second only to the Janitor Monk, but even setting aside his personal martial arts abilities, was Hui Juk also (excluding kings and princes who could command national armies) the most powerful person in wulin history in terms of the authority he held?
By the end of DGSD, he was the Leader of Siu Yiu Sect (although he was also its only member by that time), the Leader of Vulture Palace, the Leader of 1 Bun Tong (presumably, as Lee Chou Sui's heir and Prince Consort of Hsi Hsia), and Leader of the 72 Islands/36 Cave Dwellers.
I don't know of any other wulin individual who ever commanded that much authority.