Chaos actually upgraded the fireball from building to MCB level, result is around 160 tons. KN0 was also breaking the mirrors with just his chakra output alone, you'd need MCB dura just to get near him. Yeah, I get that. As I said in the following post, it's the fact that the crater made by Immortals arc Naruto's FRS was calced at 1+ kiloton that confused me the most on that. However, said calc was probably just made after mid 2010. I also forgot how bad the quality of the scanlations was back then in comparison to today. Thinking back on it, I'm not sure if we could even make out the mountains around the CT crater for a proper calc or to even eyeball the size of the crater and explosion.