Control
To some, who ruled them didn't matter. But, there were no shortage of ambitious or loyal individuals who would actively work against Dyon. As a result, one of the most important parts of Dyon's war plan with the quick and systematic assimilation of these individuals. This was why in the past, his first target would have been the Uidah thanks to the seeds he had long since planted, but now had shifted to the Five Beast Clans thanks to the existence of Monet.
Dyon understood that he had no need to control each individual. Taking control of ten billion people with just thirty million under his charge was a foolhardy affair. Instead, his task was to home in on the Clan heads and Sect patriarchs.
When the Mortal Alliance army descended, they focused in on the human tribes. As humans in a territory ruled by beasts, they were obviously far inferior in strength.