You are missing a few details. One is that the environment here calls for similar patterns of adaptation. Another, that it wouldn't explain the Mediterranoid/Atlantoid phenotype in elements in places like The Lowlands. And last, that it is the Nordid and Northern Cromagnoid input that give the different general look in the Lowlands.
And, since the Neolithic impact seems to be fairly more significant in Germany, perhaps it would explain those though to be Mediterranoids/Atlantoids? Scratch a German.. ?
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'Dardanidae duri, quae uos a stirpe parentum
prima tulit tellus, eadem uos ubere laeto
accipiet reduces. Antiquam exquirite matrem:
hic domus Aeneae cunctis dominabitur oris,
et nati natorum, et qui nascentur ab illis.'
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–Plato–
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