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I will try to give you some answers:
Originally Posted by Eldritch
You should probably read about the history of the Gheg and Tosk Albanians, it gives a lot of information to your question. Slavic admixture in Albania could have happened during the Hoxhas time, but it could have happened in the 7th century AD as well (invasion of Slavs in the south all the way down to the Peloponnese).
Regarding Gheg speakers, they were historically in constant struggle with Slavs, therefore tried to avoid mixed marriages. Even when this happened those marriages were not accepted by the Gheg community and usually the children became Serb or Montenegrin. I have my close relatives (three of them) who have been assimilated into Serbs by marriage. While, for example, Croatian & German ladies never had a problem to get integrated.
Ghegs are the north Albanians that are spread in Kosova, Montenegro, Serbia and Macedonia. This is a good map (from wikipedia) showing the distribution of the Gheg and Tosk: