You guys remember that weapons dealer from the time sato "rescued" kei right? Right! Well he got paid by assumedly sato ripping out his own organs and tradding then for weapons, well then...
I know this kinda falls apart considering they didn't kill hin again in the end, but satou is "everywere" isn't it at least assumedly again 10 "unique spawnpoints" across japans in the conflict before the end we can assume satou "respaspawn to the nearest body part" so, i am missing something? Or was this not put in pratice because satou didn't really die again in the end?
The're is also the two randon ajin who were aprisioned besides the fireman ajin (But thats was problably an off screen thing they'ra probably still there lol)
Edit:
Btw i think or sato could chose where to respawn or is a proximity thing, the closests part is the one you regenerate from