Almost like heat resistance isn’t properly defined outside of the feats for it, so there is 0 way to definitively say anything for certain. So yeah, it’s gonna be filled with maybe’s when the only thing present are feats.
What is the temperature of lightning when it hits the ground from a cloud. Deku was hit with a concentrated, prolonged stream of lightning, something that shouldn’t even normally be possible, and was not burned. I’m coming up with nearly 28,000 Celsius from a quick search.
The fire that burned Dabi, which was after he awakened so Endeavor probably didn’t even know how strong it was, set the forest on fire to 2000 degrees Celsius. All For One walked through it like it was nothing. And no, he never considered 2000C to be “powerful,” he just stated Dabi’s flames were stronger than his own from a young age/had higher potential. 2000 C just burned him alive when he tried to go all out because his body isn’t built for his own Quirk. That was him as a kid, not an adult who mastered Flashfire Fist and is stronger than Endeavor by a lot.
Dabi’s base fire is equal to Endeavor’s Flashfire Fist moves after years of training beyond the 2000 degrees statement. When Dabi goes Flashfire Fist, he vaporizes carbon fiber in seconds by just flexing his power. This is what Deku got actively attacked by when Dabi blasted him.
Endeavor is literally worse than Dabi in every way, his opinion doesn’t matter much to Deku.
