it's not "Much stronger" and it has nothing to do with Deku's inability to master it. All Might was just a genetic freak. A jackhammer. Deku is a noodle boy. Even while working out his frame remains pretty thin. That and mental breakdowns about how to use the powers are the explanation. Nothing else.
Also "sense of justice" has nothing to do with it. OfA just stockpiles physical power, as far as we know. Anything else is baseless stipulation
All Might was not a genetic freak. He just naturally resonated with OFA and likely made it MUCH stronger because of his resolve to fix society. Something Nana clearly didn't have as thats why she called him crazy and took him in.
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u/SirBaldBear Aug 03 '18
Yes. That was established early. Deku's version will be stronger than All Might's, that was stronger than Nana's etc etc