I think even the princes n kanpisi are royal families, they are not well treated in their own country. Thats why they feel not comfortable. Beside two of them look like having a good life, like their general.
When qin conquer Han, maybe kanpishi and the princes will take the lead fron their old king.
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I think riboku have a big role in this manga.
Maybe zhao will be the last conquered by qin because of this.
But if this not happening, maybe zhao will be taken and riboku will help another nation after get kicked from zao.