Weird i thought this manga would follow the story and I could have sworn that i read somewhere that Kanki survived to desert the Qin army and take up banditry again.
"In 234 BC, Huan Yi attacked Pingyang (Linfen, Shanxi) and Wucheng (Cixian, Hebei), killed general Hu Zhe and massacred 100,000 troops of Zhao. He then left Shangdang, passed the Taihang Ridge and invaded Zhao by taking Chili and Yi'an (Gaocheng, Hebei). Zhao thereupon laid the supreme command in the hands of Li Mu, who defeated Huan Yi in the battle of Fei (Jinxian, Hebei).
No record of Huan Yi is found in the Shiji after his defeat at Feixia, however in the Zhan Guo Ce (a different historical source) it's mention that Huan Yi later died by attacking Handan, the capital of Zhao defended by Li Mu in one of the last Qin-Zhao battles." According to Wikipedia, citing the Annals of the Warring States (Zhan Guo Ce) that we frequently see pop up, he supposedly lived until the last attack on the capital. Whether or not this is going to be a false figure to make them think he rose from the dead, or something else that they utilize (eg. "the spirit of Kanki invigorating Shin as if it is a second coming of The Beheader" or something like that), or if he's simply going to stay dead going forward and this is part of the fictional adaptation wiggle room, we'll just have to wait and find out.