In the manga, for Tanjiro, Zenitsu, Inosuke, Tsuyuri,
It's stated or implied that they are in Hashira level. Zenitsu alone defeated an upper moon, that puts him in Hashira level. Tsuyuri if I recall correctly it is stated to be stronger than Kanae. Tanjiro if I recall correctly it is stated to be in the level of power of a Hashira. And Inosuke along with other demon slayer defeats an upper moon.
How about Genya? Is Genya in hashira like level like the rest of students who were in the final selection with him or not?