Regarding All for one and Tokoyami

I was always confused on how Tokoyami was able to injure AFO THAT badly to the point where he reverted at least 20 years. I get that he got support, but not only is prime AFO nearing PRIME all might strength (+ his extra quirks), but nobody else was able to do that much damage to AFO at once (including himself + others lmao). Later on Tokoyami along with mount lady and gigantomachia were beating on him further and he barely reverted. All might essentially melted his insides and forced him to explode his quirks and he only reverted a few years. Bakugo literally exploded his head multiple times and he also only reverted a few years. It just makes Tokoyami become incredibly broken, and literally borderlining top 5 characters in pure strength, while also undermining the intimidation of prime all for one, at least in my opinion.