SPOILER WARNING:
Oki, i've thought some more and obviously if we're allowed to just take IVI back, it'd be problematic for the story or at the very least a pain in the pooper to continue from there.
Like R's definitely too weak to take her back, and if anyone else suggests giving IVI back to her knowing what happened.... deserves to be shot at that point.
But at least the other characters should react a bit differently than how they do now.
Thanks for reading this shorter ramble as well.