In addition, Howard didn't see "pure" Picts/Mediterraneans as the same as "Romans".
Agreed. Yet let me add that according to the Hyborian Age essay, "Etruscans base of the Roman race, were descendants of a people of mixed Stygian, Hyrkanian and Pictish strains, and originally lived in the ancient kingdom of Koth".
I don't see a very direct (or pure) line of Picts into the "Roman race", but sure there is some Pictish blood in Latium. And I wonder if this "racial connection" grew stronger with the Roman conquest of Western Europe...
Europe is not a big place (smaller still if you think about the size of the Hyborian Age nations) and post-Hyborian age Picts inhabited almost the same space as the Romans centuries later. Some connection has to be expected.