First of all, i didn't read the manga, so if the answer to this is a spoiler, please abstain or mark it as a spoiler so i can avoid it.
My question itself is a spoiler for those who didn't see Season 4 yet:
As we have seen in season 4, NightEye was gravely injured, survived long enough to be put in a hospital, until he died. Why didn't pro heroes use Eri quirk to save him ? rewind can cure his injury. If you say "Eri was sick", why didn't they bring Neito Monoma, the kid with the Copy quirk ? he can copy Eri rewind and save NightEye, it's not like it's going to take a whole day.
Edit: Also Aizawa was present to cancel the quirk if it gets out of control