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 :::I agree w/ most of what you've just synthetized Galati. A very good comment. HOwever, there's only one thing that is important. You talk about scientific studies and i strongly recommend that such articles SHOULD rely on them because they don't need literature. So, i just must remind ourselves that studies sourced in the article   such as this one clearly state this: 
 :::The results shown by the Central Iberian Peninsula seem to lend support to a model of settlement population stocks which came from the region of Castilla-Leon after the Islam invasions, whereas in the South-East populations the genetic record of Middle Eastern populations is still present, a consequence of the expansion of Islam in Southern Europe in the Middle Ages.  ''''   "