Dunno, decimal system and the integration of othet tribes, even elevating them into high position is not really unheard of in other nomadic\steppe tribes.
You obviously missed or simply did not understand what I said earlier: the decimal system and integration into a greater entity were not unique. What was unique is formation of the military units and military appointments not based upon the tribal principle. This gave the supreme leader both a complete control over all Mongolian forces (instead of being just a leader of a nomadic confederation in which every tribal leader controlled his own troops) and an ability to chose and appoint the commanders based strictly upon their merits and loyalty. It also allowed to convert the existing tribal bands into the regular army with the uniform organization and training (and ability to adopt and incorporate the totally new branches, like engineering/"artillery" troops) which was much more than could be said about most of the opposing forces.