Though he had entered into the Imperial Clan, to say nothing of the fact that Hong Tianbu was still the son-in-law of the Imperial Clan, even if it was him that had married into the clan, he may not be able to learn the Imperial Technique.
Imperial Technique was the greatest trump card of an Imperial Clan, aside from the Imperial Weapon . How could it be easily taught to others?
Only a bold, boundlessly heroic person like Brother Monkey would be so generous. On the other hand, Brother Monkey's Imperial Clan was really quite shabby. He was the only descendant left, and had not formed a powerful force at all.
Otherwise, even if the Battle Saint Emperor had died, how could he have been suppressed by a Venerate Tier-level force for two thousand years?
The Imperial Clan was not to be trifled with!
Thus, Hong Tianbu's greatest trump card, and strongest ultimate move was still the eye of the Primordial Vicious Beast that he had fused with.