In fact, Eikyuu is the most egregious example of Kan Ki getting all the credit for an operation that could not have been achieved without the help of multiple 6GG talents pretty much acting independently, and even then it came down to the wire, such that it should become clear to audiences, albeit perhaps in hindsight, that Ko Chou wasn't fighting Kan Ki so much as he was racing against the clock
in a contest fate had already determined before the Hi Shin Army even arrived.
The Hi Shin Army
arrived half a day early,
just in time to save Ou Hon's life.
Because of that, they learned what the best point of attack was, and not only that, they inherited the opportunity to complete the pincer A Ka Kin had put into motion.
Because of good timing and strong allies, Eikyuu fell before the Kan Ki Army was completely wiped out, and in taking it, they forced Ko Chou to divert too many soldiers, leaving him vulnerable.
The story demanded Ko Chou's sacrifice and so he fell, but he did not fall only to Kan Ki. Ou Hon and Shin each deserve a far bigger slice of the credit pie than they've been getting from this fanbase.