Those would be the Jomon/Ainu, European origins via Siberia.
"This was before (IMO) we had the Mongoloid race developed fully as it is today, and in any event those On The Boat would have looked more Caucasian to us, than Mongolian, and that is true of Lucia."
I agree with you on the appearance of those on 'the boat' except for Luzia. The North Chinese had not had their population explosion yet. (They would become The American Indians about 6,000 year ago). The American Indians displaced the Joman/Ainu (Kennewick Man) in North America."
"A year or so ago I wrote on a thread that I think Kennewick Man might have been an explorer, an early Viking or Lewis-&-Clark type."
There are a number of Kennewick Man's relatives out there (Skeletons), he's just the most famous.
I think Luzia (and her group) came across the Atlantic.