Are you trying to say that the albanians replaced the ancient greeks in greece and that is why there is a difference between ancient greeks and modern greeks?
"..John of Amida also known as John of Ephesus records that in 581
"…an accursed people, called Slavonians, overran the whole of
Greece……and captured the cities, and took numerous forts, and
devastated and burnt, and reduced the people to slavery, and
made themselves masters of the whole country, and settled in
it by main force, and dwelt in it as though it had been their
own. ... And even to this day [584 AD], they still encamp and dwell
there, and live in peace in the Roman territories, free from anxiety
and fear, and lead captive and slay and burn..."
Another source, the so-called Chronicle of Monembasia, states that
in the year 587—8 the Turkic Avars (with whom the Slavs were
usually allied)
"…..captured all of Thessaly and all of Greece, Old Epirus, Attica
and Euboea. Indeed, they attacked the Peloponnese and took it by war;
and after expelling and destroying the native Hellenic peoples, they
dwelt there. Those who were able to escape their murderous hands were
scattered here and there. Thus, the citizens of Patras moved to the
district of Reggio in Calabria, the Argives to the island called Orobe,
the Corinthians to the island of Aegina.... Only the eastern part of
the Peloponnese, from Corinth to Cape Maleas, was untouched by the
Slavonians because of the rough and inaccessible nature of the
country... "
[Cyril Mango, BYZANTIUM: THE EMPIRE OF NEW ROME]
But the revival was only for a time, and, in spite of Greek struggles, at the end of the tenth century Sclavonians formed almost the entire population of Macedonia, Epirus, continental Greece and the Peloponnese…….It was during these centuries, that what remained, if indeed anything remained, of even degenerate Hellenic blood absorbed or was absorbed into that of the Slav……Indeed, the Albanians appear to have done for Greece in the sixteenth and seventeenth centuries something like that which that Sclavonians had done in the sixth and seventh….They number about 200,000 souls; and within a greater part of the districts occupied by Albanians at the present day the Greeks have been as completely expelled as the Celtic race in England by the Saxon. Unlike the Greek, for him the bonds of nationality are stronger than those of religion…..to assert that a Greek Christian is a Hellene is as reasonable as to call all Roman Catholics Italians; and to claim a Slav or Albanian as a Hellene because he speaks Greek, is much the same as calling an educated Russian French, or an Irishman English, because they prefer French or English to their own less developed languages. (A Monthly Review – Greece, Spoilt Child of Europe)