Review Detail of Bob4President in Demon Slayer: Sea Hashira

Very good fanfiction. The only thing I don't understand is, why is he so weak? I mean he is supposed to have a really strong body and is two years older than tanjiro, so then why are zenitsu, inosuke and tanjiro as strong as him. There is also the fact, that he still didn't use sun breathing or isn't he aware of how to use it? After all even if he didn't Tanjiro would've talked about it.