OK! Theory Time! Manga Spoilers ahead so don't read if you don't want it to be ruined!
I warned you.
So, I was thinking earlier about BNHA and stuff and I can to a realization. The doctor that told Izuku and Inko that Izuku was quirkless, is the same doctor that works for All for One! Idk if it has to do with anything in the Anime/Manga in the future, but it's a fun theory to think about!