Yeah, but a similar thing could be said about Turkey. A big number of Turkey's population is consisted of people who speak Turkish, feel Turkish but their grandfathers or great grandfathers (especially their great great grandfathers

) were actually islamized Slavs, Greeks or Albanians who were colonized in Turkey.
Don't forget the population exchanges between Turkey and other countries (most of all Greece, and the population exchange in 1923). The people who left Greece weren't only Turkish. They were all muslims but they weren't all Turkish. Many of them were actually islamized Macedonians, Bulgarians etc.
So if we talk about the descent and the "blood argument" we can also say that Turkey's achievements are a result of colonialism and population exchanges.
P.S: I know Hakan Sukur has an Albanian mother. Senturk has Macedonian descent and i'm sure the same could be said about many more.