So this is obviously a spoiler thread based on history. The author tends to take a ton of liberties and make changes to fit Shin and crew in and to make the story more enjoyable. Here's my speculations thus far.
According to History, Tou's army single handedly conquered Han. It was a weak state that crumbled in less than a year of assaults from Tou. I think this is probably going to play out the same.
In terms of what's going on now, historically speaking, Kanki will lose this fight against Riboku. He'll lose pretty much his entire army, he escaped the battle and ended up betraying Qin, in an attempt to assassinate Sei, he was caught and executed. Riboku after this battle pushed the Qin back hard. Qin then sends Ou Sen, Kyou Kai and You tan Wa to conquer Zhao. After several stalemates, natural disasters struck Zhao which weakened it, causing Qin to gain the upperhand. Qin then bribed some court officials to place discontent within the courts to cause the King of Zhao to mistrust Riboku, eventually causing his execution, which lead to Zhao being conquered by Qin.
Now, what I think will happen. Kanki will lose this battle just as he does historically, but I don't think he'll flee and get killed attempting assassinate Sei. I think Riboku himself would actually kill Kanki, because it'll be more action packed that way from a story perspective. And when Qin launches it's 2nd attack on Zhao, instead of Kyou kai, I'm convinced that it'll be Shin instead as the general that leads on one of the fronts. He'll be promoted to General for killing Keisha. And Kyou kai obviously will be his deputy and bumped up to 5k Commander. Also, I don't think Riboku will be executed either, I think Shin will end up taking him out.
Thoughts and Opinions?