as to the language - mutation. Maori languages have changed so dramatically since the advent of the European; that it is now called Book Maori as opposed to tuturu Maori (pre-European maori). As you can imagine - Tuturu Maori can not be taught in schools as each tribe had their own dialect - sure there were commonalities however the language was monosyllabic so meaning increased or decreased according to preceding, proceeding or successive actions. We have a clear indicator through DNA correspondence where we originated and distinct physical likeness is the seal for me. The ancient Taiwanese are approximately 30000 to 40000 years old. That also ties in with Maori and Mori-Ori folklore (of which I am a descendant of both - Toi is the father of Maori and Moriori alike.).
I agree that ALL polynesians probably are descendants of a group of people having their origins in what is not Taiwan, the Philippines and Indonesia.
There are linguistic links to early indonesian languages. For example, although the Indonesian word for a coconut is “kelapa” and a coconut tree “pohon kelapa”, there is another word used only poetically for the coconut: “Niur” Coincidence? I doubt it.
As another exercise look at the names of numbers from one to ten, not in Indonesian, which adopted many Arabic words,but at Javanese or Balinese and compare them to the Maori words. No one could deny the linguistic connection.