When the Golden Wheel Monk first appeared in ROCH, he was quite a surprise (to both readers and the characters of the novel) because nobody had expected that there was another, previously undiscovered Greats-level fighter in the world. That means that unless the Golden Wheel Monk received his great inner power and martial arts techniques Hui Juk-style (not likely), he'd been training for years...during the time of LOCH and possibly even earlier.
How powerful do you reckon the Golden Wheel Monk was at various stages of LOCH (i.e. the beginning of the story, the period when Gwok Jing and Yeung Hong were growing up, and the years when young Gwok Jing had his adventures with Wong Yung)? Do you think the Golden Wheel Monk was already Greats-level even during LOCH?