First, I'd like to address the frequent mention of the use of the honorific "kun."
Although it may seem unfamiliar to some readers, using "kun" is perfectly appropriate. It's a respectful term without gender distinctions. The same goes for "chan," which is also gender-neutral but generally used for very close relationships. Given the current relationship between Kai and Hyuga Ryo, expecting them to be close enough to use "chan" is unrealistic. It's already fortunate that they're not stabbing each other in the back.
Secondly, a reader commented in the reviews that the protagonist is too weak and cowardly. Weak? Kai's abilities are not weak at all. Despite the restrictions I've imposed, in a one-for-one exchange, he's formidable, unmatched unless you bring out something like "Izanagi." Who can compare with him in a desperate exchange? As for why he seems weak, come on, after fighting for so long, do you still have ample chakra? Would he dare to use the Mangekyō Sharingan if his teammates were still standing? What if he gets exposed? That would be even more troublesome, right? And as for being cowardly? He's cautious now, but he's not a pushover just trying to get by each day.
Another question was why he didn't summon Minato immediately. Well, Kai forgot about Minato's habit of arriving late.
Lastly, a comment mentioned why they would still blow up the bridge if Iwa is retreating. That chapter's title made it clear: the mission has already changed. Initially, the goal was to force Iwa to retreat, but Kai, being overly cautious, decided to save a group of prisoners to use as shields. Whether willingly or not, these prisoners ended up completing Kai's task. When a chaotic group starts causing trouble behind enemy lines, even if they can't fight well upfront, having your rear set on fire is a nightmare.
Furthermore, Konoha, which was initially struggling, is now seeing Iwa in disarray. Do you think the Third Hokage and others wouldn't want to capitalize on this?
Regarding why Minato doesn't go himself, my interpretation is that his main strategy is to pressure the front while Kakashi uses the Flying Thunder God Kunai to strike critical targets. This is just my understanding.
That's all the explanations for now. I'll address more questions next time, depending on the situation