A snippet on the Ainu
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However, it is true that they have a significant amount of gene flow from the caucasian ancient north eurasians.
On that note, I posit a theory that the caucasoid skull is ancestral to the mongoloid skull given the amount of primitive heavily isolated east Asian groups (ainu, Polynesians, some natice americans, etc) that have large and robust caucasoid skulls who would not have evolved a mongoloid phenotype in east Asia. Some of these people also have little to no ANE dna. The skull shape is also very similar (much moreso than a caucasoid or mongoloid and a negroid skull). Southeast asians and negritos are irrelevant to the question as they are mixed with dravidian/Australoid types, itself a heavily devolved caucasoid type.
Tianyuan man also had a very long and robust, caucasoid skull, and he was decidedly not west eurasian at all, instead being the earliest example of distinctly east eurasian blood