Danaus and Cadmus were of Greek origin. The myth can be interpreted as Greeks ruling Egypt and Phoenicia then returning back to Greece. Danaus returns to claim the throne of Argos because he was descended from the king of Argos.
This is incorrect. The video address clearly Daunus was egyptian decent. And origin.
Also, he is referenced in menethos book as son of belus who migrated to greece argos.
About danaus its shown @ 6:44
However, it seems like people don't want to read through the video.
Also, there is no evidence that cadmus is greek origin
For they say that Orpheus, upon visiting Egypt and participating in the initiation and mysteries of Dionysus, adopted them and as a favour to the descendants of Cadmus, since he was kindly disposed to them and received honours at their hands, transferred the birth of the god to Thebes; and the common people, partly out of ignorance and partly out of their desire to have the god thought to be a Greek, eagerly accepted his initiatory rites and mysteries. 3 What led Orpheus to transfer the birth and rites of the god, they say, was something like this. 4 [Cadmus, who was a citizen of Egyptian Thebes, begat several children, of whom one was Semelê; she was violated by an unknown person, became pregnant, and after seven months gave birth to a child whose appearance was such as the Egyptians
Also He was son of Aegnor, who was son of Belus, an Egyptian king, so Cadmus and Danaus were kin through egyptian decent and bloodline
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