Scripture gives casual evidence to the existence of other people.
The Divine Principle makes no comment on the issue either way, indicating it's lack of significance. The Divine Principle makes no comment on a pre-Adamic race. Though there are hints of other people dwelling at that time in scripture, it is superfluous, peripheral issue the main theme of the salvation of Adam's descendants. The Divine Principle is in basic accord with Usshur's chronology. How can you justify many of your historical dates.