There is no difference between a 5% punch and 5% Full Cowl.
And Deku said he was using everything he had against Shigaraki, you're just creating a false difference to justify an obvious outlier.
That’s the crux of the argument yes?
Give me examples of Deku punching at lower percentages with anything other than 100%. To make that claim, you require evidence to support it.
The best example of this exact scenario is from the Sports Festival, where he punched Todoroki with 5% and it throws him backwards several feet. However, the kicker here, is
Base Deku is also capable of pushing Todoroki back several feet with a headbutt. Is it a feat to launch someone back like that when even your base is enough to harm them? Especially, even further, that Todoroki was weakened from ice forming on his body?
Even further, let’s talk speed. When Deku is fighting Gran Torino, he manages to predict his trajectory, and punches at him with a 5% enhanced arm. GT, who is being extremely casual, dodges it while it’s making its way towards him, saying he’s too stiff. Then, later, when he gets Full Cowl, in exactly 3 minutes, where it’s straining all his muscles, he’s able to react to Gran Torino and actually tag him? Gran Torino has to actually try and avoid his attacks, when previously he could react to his single arm like it was nothing? If they’re the same speed, why would it take more effort?
Also, let’s look at the LITERAL display of 100% being weaker than Full Cowl 100%, which is in the movie itself, RIGHT before the cloud dispersal feat. Deku tries to punch Nine’s tornado away (not even the storm clouds, JUST the tornado destroying everything) and he fails, heavily. He barely makes a dent in it before it overpowers him. Compare that to him and Bakugo clearing the combined, forced downwards spiral of a storm Nine was creating with FC 100%. It’s not even comparable the clear power difference between the two.
Heck, even in Overhaul, we see a gap between the two. Remember how Deku used 100% on his leg to kick at Overhaul before flying out of the base? Remember how BASE Overhaul didn’t immediately die from the air pressure of that attack? Well then, here comes Overhaul fused with Katsukame, amped up on energy from Ryukyu and Nejire, getting his body literally blown to pieces by Deku’s attacks like it’s nothing. He got so much of his body punched off that he went from near city block sized to smaller than the hole Deku made. Even Deku just
moving past Overhaul was blowing pieces of his body off. The strength gap between a single attack at 100% and the full body’s movements at 100% are VERY easy to see.
Also, and this is for everyone that doesn’t understand this:
PUNCHES DO NOT HAVE FULL POWER FROM JUST YOUR ARM AND SHOULDER.
Punches take full body movements to be even remotely effective. If base Deku launches a 100% punch, it is not going to be as effective as 45% Deku launching a 100% punch because the different muscle groups and categories are being ridiculously amplified by One For All. It is literal physics that a punch at 100% with only the arm being strengthened is going to be far weaker than that exact same punch at 100% with the entire body amplified to the same degree.
Last point: the infamous “I’ll use everything I have” argument.
If Deku was really using every last bit of power he had at that point, he would’ve gone Full Cowl 100%. No if’s, ands or buts about it. He would not be at 45% spamming 100% attacks, he would be full power, hair spiky and glowing, beating the shit out of Shigaraki. Are you seriously telling me that, in this situation, he WOULDN’T use Full Cowl 100% if he was allegedly using everything? Unless there’s some non-confirmed reasoning for him to not use it, he was very clearly not going as all out as he claimed due to his rage and usage of multiple quirks.
Heck, we even SEE that he has higher power than what he was outputting against Shigaraki when he enters a real rage state. He blew a chunk of Shigaraki’s head off with just a graze when he got mad, and the visual differences between his two states are clearly indicative of the power he is wielding. Are you attempting to imply that the glowing eyes, spiked hair and animalistic fighting style that bit through rivet stab like a cracker are the EXACT same strength as the 100% smashes he was doing earlier?
The rage state Deku enters is practically a pseudo-Full Cowl 100% visually, and we know that visuals matter for One For All a lot. So to claim that what Deku was doing against Shigaraki was, without question, every bit of power he had, is ridiculous. Whether it was subconscious or he literally can’t do it on command, or was worried about dealing with the extra quirks, it doesn’t matter; he did not use Full Cowl 100% against Shigaraki, despite it objectively being the strongest he can become, and only somewhat neared a state similar to it after becoming enraged. He did not go all out and use everything. His statement there is directly contradicted by his actions and what we know of his real power.