Now I'm not a mathematician like some of the members on this website but there should be a clear difference between deku charging full speed at someone with 8% then punch with 100% and deku charging at someone with 100% then punch with 100% right ?
Not enough to justify a 200X gap like people are suggesting, especially since I've already contested that logic above.
Izuku with a single arm 5% punch can injure Todoroki, who can withstand being kicked by Recipro Burst, which can injure Stain, who took two punches from 5% Full Cowl. Despite the fact Full Cowl may have increase the output due to how muscles work, the physics behind it do not allow for a 200X increase.
Izuku clearly states, with no room for interpretation. That he was hitting Shigaraki with everything OFA has to offer, and he did not care what would happen to him. Yet people insist that the statement is wrong for no actual reason. I personally believe Izuku himself, instead of saying physics doesn't allow that.
This is fiction, it doesn't have to follow reality, it follows its own rules. If Izuku states he can unleash everything OFA has to offer while he's floating in mid air, then I'll believe him over "physics". It's likely that Full Cowl is indeed stronger, but it not that big of a gap that we can say Full Cowl multiplies his power by hundreds of times.
However guess what, in real life you can't put 100% of your power into a single limb like Izuku does. This isn't Izuku's muscle strength, it's a fictional power called a Quirk and he can fill his limb/body with that strength. He doesn't produce that energy with his muscles, this energy is stored inside of OFA and can be put into his body/limbs when he activates OFA.
100% energy inside of a single limb vs 100% energy spread around his body, no extra energy is being created here. The only difference should come from Izuku's base strength, which is vastly inferior to 100% that it doesn't even matter. Like I said, physics can take some hold here still, but not enough to say his strength increases by 200X.