Speculation time:
Thanks to Ah Chu, Kiu Fung had possession of Shaolin's Yik Gun Ging for a time, but he was never able to take advantage of it because it was written in Sanskrit, a language that he couldn't read.
What if, however, somebody had translated the manual into Chinese for him? If Kiu Fung spent five years in isolation training in the Yik Gung Ging, how much more powerful would he have been when he emerged?