Ataturk was a member of Itthad ve Terakki once, but his ideas were totallu against theirs. Ataturk was all against Turan and Enver Pasha was his rival. He was declared a traitor by the Ottoman government, so practically, he was against both.
But he developed some of the ideas of Young Turks, such as nationalism and secularism. He was influenced with their purpose of creating a modern Turkish nation from the multiethnical, collapsed structure of the empire. His other actions were against the purposes of Young Turks.
I think you're referring to Chamli Hemshin, a region east of Rize. There lives no Armenians or Rums there, but Islamicized Georgians and Laz. Most of the Muslim Rums live around Trebizond, but there arent any significant numbers of Armenians.
The Sevres treaty gave the cities of Trebizond and Erzincan to Armenia, but those cities didnt have major Armenian populations. As I said, Erzurum, Kars, Bitlis, Ardahan were the most Armenian populated cities.