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You are confusing eras. Oghuz Turks are the ones that started the Ottoman dynasty. The group you are talking about divided into two parts (east and west) and collapsed without conquering the heart of Anatolia or establishing themselves in a meaningful way. Oghuz were a part of them. They conquered the Byzantine Empire. Just like many people in Western Europe are descendants of Charlemagne, the same principal applies: genetics filter downward through a population through the ruling class. Since the Turkic ruling class was prolific, and we are not talking even about a single man, many today posses their genetic markers that set them that are similar to Turkmen today. There are also more Turkic groups in Turkey today than just the Oghuz that also arrived in non-recent times.
As far as examples, just look at any Turkish user's results here. I don't keep them on-hand, and I currently only have studies about Turkic Hungarians.
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