Coon thought that Nordics/Nordoids were not the result of a reduction of Northern UPs. To prove it he showed these photos:
Irish youth from County Longford
A blond Moroccan youth form the Rif
His conclusion was that was impossible to derivate a "Nordic" from a reduced UP. Anyway, there was a problem: the presence of both robust and gracile types in spots such as the Rif. In my opinion Nordids are at least partially UPs who had reduced through some selective process due to favourable climatic conditions or other factors. This hypothesis, however, should be proven with genetic data.