History /
Poland is great Mother of all Slavs from Baltic to Balkan [177]
So you suggest that the Slavs who emigrated in 7th century from Oder(white Serbs) mixed with Slavs who already lived in Balkans but had been reduced due to barbarian invasions?
It reminds me of a nationalistic greek theory which claims that the Vlachs who came from Romania were actually Greeks who came once again to Greece and the same the Bulgarians who descended were also Greeks who had lost their identity and become Bulgarians,so we should have claims all over the balkan peninsula and half of Asia Minor.
The reality in my opinion was simpler.Greeks liked to live near the sea.So they gradually inhabited all the coast line which is in today's Greece,Adriatic coast,Asia Minor,Black Sea,South Italy,Sicely,Libya and even southern France.The problem was that Greeks controlled only the coast line and not much inside which means that they were vulnerable to attacks from barbarian tribes who lived in the land.In this way they gradually were forced out of Black Sea,Italy,Africa and later from Asia Minor.
There are still some remnants of Greeks in these areas but I don't have the illusion to believe that once all Asia Minor,Libya,Sicely,south Italy and Balkans were greek just because Greeks inhabited the coast line.
The same is true with Slavs.You cannot claim that everything belonged to you since you inhabited part of these places which was in most cases around mountains.