Responses
the "become human" medicine didn't work on Muzan, so it most likely didn't work on Nezuko too but Nezuko has to hid from Muzan because she can walk in the sun and Muzan wants that
this is becoming a roller coaster
in the red light district arc, Nezuko was going toe to toe with the girl upper moon
so maybe Nezuko vs Muzan

Giyuu: injured
Tanjiro: injured
sanemi: injured
gyomei: injured
inosuke: injured
kanao: injured
zenitsu: injured
mitsuri: fighting upper moon 4
obanai: fighting upper moon 4