Genghis Khan's kinsmen deserted him and the common herders he promoted never did — that asymmetry is the first explanation of the Mongol army.

I think the first point is the extreme loyalty of the people whom Genghis Khan chose. His kinsmen, as we said, had deserted him, his anda was a questionable relationship but all the others that he found were just common people, herders or hunters, very common, and they were loyal to him and never, ever revolted against him, never betrayed him.