If we're using the 630 meter depth, a single missile would be 156 MT. But do you think, in this case, we can scale Shigaraki to Baseline 7-A+ (550 MT) for taking a direct hit from 100% to the face. Since just air pressure from a previous 100% punch, was 740 MT.
Yes his jaw was almost ripped off. However, I think his durability was less than normal since his body was breaking down and splitting open. When he regenerated, he was shown to be more durable than before. Since Izuku landed multiple 100% hits on him, and it wasn't like he was punching holes through him.
Another question,
is this kick 45% or 100%. If 100% than this shows how after he regenerated his body became more durable since it was fixing itself. If it was 45%, than at least this is a feat of Izuku harming Shigaraki. Since that is a noticeable bruise from that kick.
I’ve often thought that kick was 100%.
The wording, however, is strange, and seems to lean either way. He claims “he’s adapting to my 100% attacks and taking hits! But… his wounds are healing slower, the damage is sticking!” Immediately after kicking him. This implies that the kick he just did was 100%, and through the damage it did, he can see Shigaraki is weaker.
However, he then only references the two punches he did against Shigaraki. “The last two 100% attacks wrecked my left arm!” This implies his kick WASN’T 100%, because he would have counted it as a third attack.
I suppose, if you want to assume this kick right before he declares “I will now be going all out” was 45%, you could interpret the statement of “he’s adapting to 100% attacks” to mean that his 45% was not going to be enough.
In that case, the sequence of events would be:
1) Deku kicks Shiggy at 45%
2) Deku sees that Shigaraki took the hit, and realizes that Shigaraki has adapted to the previous two 100% punches, meaning 45% is not enough
3) Deku then realizes the damage from his 45% kick is sticking and not being instantly healed. The damage from his 45% kick is still there in the form of that bruise on Shiggy’s stomach.
4) He decides to use 100% attacks for the rest of the time to defeat Shigaraki, even though his first two attacks at 100%, the punches, broke his arm.
This would be the interpretation of events if that kick is 45%.