The Kazekage's disappearance was actually a foreknowledge perk for a transmigrator. The news Miwa Masayo brought was this: the Kazekage had not appeared for nine days.
Other than him, no one believed that the Third Kazekage had gone missing. Not only had the Ninja World reached no such conclusion, even Sunagakure's higher-ups did not know their own Kazekage was gone.
For top-tier ninja, their own strength and ninjutsu were their greatest secrets.
It was perfectly normal to avoid everyone while secretly practicing some ninjutsu or combat technique, vanishing from public view for seven or eight days or even half a month. There was nothing strange about it.
Moreover, as the leader of a village, the Kazekage held who knew how many secrets. It was only natural for him not to show himself in public.
Only a transmigrator knew that this was the fuse of the Third Shinobi World War, the reason Sunagakure would begin the war by savagely biting into Konoha like a rabid dog.
Konoha had already grown lax. Of the Sannin, only Orochimaru remained in the village. The front lines had neither a Kage-level expert in command nor an experienced veteran commander who had lived through the previous war.
Uchiha Yu had confirmed it long ago: the front line's main commanders were all trash jōnin who had risen through seniority and their closeness to the Konoha F4. Under their command, Konoha would inevitably be caught off guard and thrown into panic at the start of the war. They might even consider concealing the truth to lessen their own blame. Only after they had been utterly crushed, perhaps even wiped out to the last man, would the Third Hokage receive accurate intelligence.
In short, until Sunagakure's frenzy was beaten out of it, Konoha's front-line ninja would remain in danger.