Shit, that actually makes sense,
Black Angel . Going back in time would explain why mooks go back to life in Sekiro, and differentiate it from Souls' undead mooks. Even if it's not always consistent (as your example in the memories). But then no Souls game is.
BTW, what's explanation for DeS and BB mooks respawning again? I think in BB case it could be two things: a. The population infected by the eldritch blood making them undying just like Souls or b. Everything is a dream (even Yharnam) that resets in some fashion.