At the moment, the entire fourth generation can learn the "Swallowing Heaven Emperor Technique" that Gu Feng gave to Gu Weimin.
Later, this "Emperor Level" secret technique will also be passed down to the direct lineage clan leaders as inheritors.
However, the secret techniques Gu Feng gave to the other branches are one level lower, belonging to the "Supreme Level," the same level as those learned by their Ancestor Grandmother Lin Yue.
If they mastered them well, becoming a high-tier expert of the Nineteen Layered Heaven like Gu Qingxue wouldn't be out of the question.
But in cultivation, what's important is how you improve and evolve your own secret techniques and then achieve breakthroughs.
This is evolutionary ability, and it's also the path Gu Feng hopes these cultivators will seek in the endless march of time.