Damn, this post became too long, so I shrank it to the core argument. I may make a separate thread about the details revolving around this topic someday later.
I just read the first pages of this thread where ppl still hadn't read the english scans of the chapter so I can't speak about what was said after it but I disagree with how godly people think the FH should be. We already have some reference for that. 1% of Urek Mazino's strength is enough to OHK someone with Karaka's durability at FoD. I'm not counting his haxes and oddities that make him quasi immortal and etc. That's also why I said 1% Mazino's strength can OHK someone with Karaka's durability even though he actually survived that, although barely, and was able to regenerate.
So take Kallavan, for example, who has much better endurance than Karaka. He would simply not be instantly fodderized if Mazino used 1% of his strength. It would probably hurt him (each hit he'd take* in this hypothetical scenario), but not as bad as, for example, HJ's transcendental floral butterfly technique did, maybe it'd take one hit with say 5% of Urek's power, the amount he originally thought would be necessary to solidly beat Karaka and White. Which shows that UM is on another level when compared to HJ, but not like "I don't have to do anything to kill you, the indirect consequences of something as basic as my normal breathing is more than enough to stomp you". Yama and Yasratcha are on HJ's league, the (in)famous "CC level", and he's dealing with both of them, at least in this chapter.
Since Mazino is stronger than Traum, he would have to "use more than 5% percent of his power" without taking power dynamics and matchup in consideration i.e. some fighting styles, skillsets, particularities are good against some and bad against others. We don't know how much of his strength Traumerai is using, but it's safe to assume it's not much. Given how those Shinheuh can probably transform and things like that (like the windbird), and Traumerei probably didn't expect Yama and Yasratcha to have Full Transformation powers, he also underestimated their strength. Great Animas or at least Traumerei probably benefit of a "the whole is greater than the sum of its parts" kind of effect by increasing the amount of Kaijus attacking you at the same time with each of their haxes and specialties complementing one another. That dragon seems to have very big AoE damage, but it's freaking huge, too easy of a target. That eel was shown multiple times to be able to regenerate, it could use itself as a sacrificial body and protect the dragon, for example. With each Shinheuh added the power level growth is not linear.
Edit: spelling.