It is always hard for outsiders to established themselves in the Three Kingdoms
But this is a special time where most of the outlanders who enter the Three Kingdoms and declares themselves as Kings or Queens could easily gather people of the tribes to fight under them
After all, now there is even the people of the Ten tribes in the mix.
Arial know that the enthusiasm of the original inhabitants to attach themselves to a foreign ruler is because the Thirteen Tribe believe the prophecy.
As for the other warlords that had been popping off, they were either trying to strike it rich and famous by using the name of Asrana or people who wanted to snatch the fate of Asrana
After all, to many of the tribespeople, the old lore could be interpreted in many ways. To some, the position of Asrana is not entirely fixed.
Not all believed that Asrana identity was determined from the start.