After Duge became the head of the Propaganda Department, he did not promote his zodiac culture.
Going with the flow in a way that involves everything, in cooperation with zodiac culture, is like a super-sized cheater, which could help him and the people on the planet to improve quickly.
But at the moment, Bai Long was closely watching him; without the certainty of dealing with Bai Long, exposing himself would be truly foolish.
As for the rapidly growing spiritual power, he attributed it to innate talent and his cultivation technique. A drink from Bai Long could boost his spiritual power by tens of thousands, so this stuff shouldn't seem too extraordinary to him, easy enough to dismiss...
However, without utilizing zodiac culture, other things could still guide trends.
So.