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Currently it is accepted that One For All's power amplification doesn't extent to the host's durability. We may need to talk about this
Introductio
The reason most characters have their durability scaled to their striking strength and Izuku doesn't is something to do with newton's third law. If you exert a certain amount of force on something you'll experience the same amount of force being exerted on you. To my knowledge it is assumed that this reaction force is what ends up breaking Izuku's limbs every time he uses 100% meaning that his durability isn't being enhanced alongside his physical strength.
There was also a point I saw used that Gran Torino could knock Izuku out of 5% as a support to this. I'm not actually sure why this is supposed to support OFA not being a dura boost so feel free to explain it so I can understand.
Now then, I will move on to the counter evidence against this interpretation
Counter 1
Something that I didn't realize myself at first but was pointed out is that OFA not affecting durability implies that All Might had the same level of durability throughout his whole run as a hero or that his durability comes from his own training rather than his quirk. It is plain to see why neither of these possibilities are likely considering that a quirkless person being naturally more durable than some of the toughest characters in the series is outright impossible and from what we know of the series so far training to become this strong is also not in the realm of possibility.
You could argue that there's a third interpretation, that some unknown event caused All Might to have equal durability to his AP. But if this was true then don't you think we would have at least gotten some vague allusions to this? Of his durability deriving from a source other than his powers? This interpretation should also be disconsidered since it would be the very definition of Occam's razor.
Counter 2
The second and third counter evidence deal with the limb damage supposedly being a result of reaction force
This is a dialogue Izuku's doctor has after he examines the detail of his injuries from the Muscular fight. He states that the damage received by Izuku resembled Firecrackers going off inside his hand. This doesn't line up with the damage being a result of reaction force very well instead, implying that something was destroying Izuku's arm from within. This means it was the power from OFA itself that eats away at his arm every time a full power punch is used, not the counterforce of that punch paired up with an insufficient durability
Counter 3
For further evidence of 100% damage not being reaction force, let's take a look at 20% Izuku. Using this form causes Izuku immense pain, even when he's not making any movement he feels his bones and muscles creaking. Notice anything? 20% percent Izuku is suffering the consequences of OFA even when he isn't launching any kind of attack thus not making it possible for any kind of reaction force to be applied back at him. Logically speaking, the effects of 100% should not be anything other than the effects of 20% but amplified to a much greater extent, so if the damage he takes in 20% isn't the result of reaction forces then why should 100% be?
Summary
Izuku's limbs breaking at a 100% isn't a result of the force of his attacks being applied back at him, it is a result of OFA itself destroying Izuku's body from the inside when utilized. You may argue that OFA being able to do this is itself evidence of Izuku's durability not increasing but, at the very least I don't think it provides as much solid proof of OFA not interacting with durability as the newton's third law interpretation would. All Might having durability comparable to AP also goes against this so I think it's safe to assume that One For All indeed is a durability boost and Izuku's stats should be adjusted to reflect this.
Izuku's durability should be split up in additional keys to correspond to the output of One For All that he's using, with the possible exception of 100% since even if he's theoretically getting a boost in durability he's certainly not getting the actual ability to fend off City Block level attacks while activating 100%.
Any objections?
Introductio
The reason most characters have their durability scaled to their striking strength and Izuku doesn't is something to do with newton's third law. If you exert a certain amount of force on something you'll experience the same amount of force being exerted on you. To my knowledge it is assumed that this reaction force is what ends up breaking Izuku's limbs every time he uses 100% meaning that his durability isn't being enhanced alongside his physical strength.
There was also a point I saw used that Gran Torino could knock Izuku out of 5% as a support to this. I'm not actually sure why this is supposed to support OFA not being a dura boost so feel free to explain it so I can understand.
Now then, I will move on to the counter evidence against this interpretation
Counter 1
Something that I didn't realize myself at first but was pointed out is that OFA not affecting durability implies that All Might had the same level of durability throughout his whole run as a hero or that his durability comes from his own training rather than his quirk. It is plain to see why neither of these possibilities are likely considering that a quirkless person being naturally more durable than some of the toughest characters in the series is outright impossible and from what we know of the series so far training to become this strong is also not in the realm of possibility.
You could argue that there's a third interpretation, that some unknown event caused All Might to have equal durability to his AP. But if this was true then don't you think we would have at least gotten some vague allusions to this? Of his durability deriving from a source other than his powers? This interpretation should also be disconsidered since it would be the very definition of Occam's razor.
Counter 2
The second and third counter evidence deal with the limb damage supposedly being a result of reaction force
This is a dialogue Izuku's doctor has after he examines the detail of his injuries from the Muscular fight. He states that the damage received by Izuku resembled Firecrackers going off inside his hand. This doesn't line up with the damage being a result of reaction force very well instead, implying that something was destroying Izuku's arm from within. This means it was the power from OFA itself that eats away at his arm every time a full power punch is used, not the counterforce of that punch paired up with an insufficient durability
Counter 3
For further evidence of 100% damage not being reaction force, let's take a look at 20% Izuku. Using this form causes Izuku immense pain, even when he's not making any movement he feels his bones and muscles creaking. Notice anything? 20% percent Izuku is suffering the consequences of OFA even when he isn't launching any kind of attack thus not making it possible for any kind of reaction force to be applied back at him. Logically speaking, the effects of 100% should not be anything other than the effects of 20% but amplified to a much greater extent, so if the damage he takes in 20% isn't the result of reaction forces then why should 100% be?
Summary
Izuku's limbs breaking at a 100% isn't a result of the force of his attacks being applied back at him, it is a result of OFA itself destroying Izuku's body from the inside when utilized. You may argue that OFA being able to do this is itself evidence of Izuku's durability not increasing but, at the very least I don't think it provides as much solid proof of OFA not interacting with durability as the newton's third law interpretation would. All Might having durability comparable to AP also goes against this so I think it's safe to assume that One For All indeed is a durability boost and Izuku's stats should be adjusted to reflect this.
Izuku's durability should be split up in additional keys to correspond to the output of One For All that he's using, with the possible exception of 100% since even if he's theoretically getting a boost in durability he's certainly not getting the actual ability to fend off City Block level attacks while activating 100%.
Any objections?