any more specific details u can remember? he seem more like born
and bred in japan to me.
anyways, i believe "japanese" as a race doesn't constitute solely
on chinese immigrants. but also from other east asian races, over a
long period of time, slowly migrating instead of a sudden influx of
chinese migrants.
because of these differences, the people there could never be
united under a single banner, but under smaller clans and tribes,
all the way till himiko's court.
further more, when the qing shi huang's people reached there, there
were already a societal system in placed there, no matter how crude
it could be. people were already living there.