the whole darci thing is self resolved. once MC and darci finish saving the day, current darci will then go back systematically to each time and location ninja darci appeared and save herself. like captain america returning all the stone and time stolen junk and placing in its proper place, but more realistic like when rick n morty have to sew snake disguises for themselves instead of enjoying the holiday, cause eventually they have to do it otherwise it never got done. which as we all learned from futurama in order for everything to make sense, bender had to go back in time and stick the time code on fry's ass, I'm bender, but at the end