The way in which he commits to warfare is insane and yet incredibly effective. He beats powerful opponents, they admit it, and yet they all belief he will meet a sticky end. Even if he survived this war, are his methods sustainable? Does he rely on crazy-ness too much for it to continue working for decades?
Kanki's methods are sustainable for Kanki himself since as far as he is concerned, as long as he and his immediate close circle survive then he considers it a win. Everything else and everybody else are completely expendable.
Kanki's methods are not however sustainable for whatever nation he fights for. Kanki is a loose cannon that will happily toss whole armies into the meat grinder as long as he gets the result he desires.
Besides his lack of care for his own troops, Kanki's plans are 100% high risk, high reward, all or nothing gambits. If his plan succeeds then he scores big time. If his plan fails, he is completely screwed.
The current arc shows all of Kanki's flaws as a General for his nation.
The goal of the campaign is to secure Northern Zhao. Kanki has shown zero interest in achieving this goal. He only desires Riboku's head and has taken an egregious amount of risks and subsequent punishments in order to attempt to do just that. He has lost the Fuu Han Army and the Heki Army before he was even in a position to attempt his eventual ambush gambit and now he is set to lose his very own Kanki Army.
The campaign was a failure the moment he lost the vast majority of his men against Riboku's encirclement. Without a large army he couldn't possibly secure Northern Zhao. Everything after that was just Kanki acting on his desire to claim Riboku's scalp.