Waves of migration

Given we're all buying into the founder effect to explain tūrehu and other aspects of my skin and hair, I think this opens up the door to discussing multiple waves of migration from Polynesia to Te Riu-A-Māui. In the Far North of Europe, people have much paler skin than Mediterraneans. If the founder effect had held true, then later and current Tainui etc. groups would be lighter-skinned than people from the Polynesian islands. This isn't true, so that suggests people were mixing throughout our settlement history. Instead of one wave ca. 1350, it might have been lots of waves until colonisation. Ngāti Porou believe something along these lines.