Holmes understood.
What troubled the Party Chief was not the overt Aztec People, but rather the 'spies' who might be hidden among Humans.
These spies had already blended into society over tens of thousands of years, their behavior indistinguishable from ordinary people, and they had even intermarried...
Thinking of this, Holmes curiously asked, "What would happen if the Aztec People intermarried with us? Is there reproductive isolation?"
The Party Chief immediately said, "There is no reproductive isolation; the children born can absorb the Divine Power of the creator and also gain the Power of the Outer Gods."
"How then can we investigate someone's identity?"
"That's the most difficult part," The Party Chief lit another cigarette, looking worried. "The children born from intermarriage can gain both the Power of the Outer Gods and the Power of the creator, but the Power of the Outer Gods and the Power of the creator cannot coexist in one person."
