Nani must have had some sort of deeply entrenched command programmed in her mind that when Saya reached a certain stage of maturity... she would be obligated to undergo the process of turning her into a vessel.
So to avoid that... she did the ultimate sacrifice.
Daigiren can burn in hell.
You know... for some reason, now that we know the plan the fucktards of Daigiren had... I can't help but compare them to the dipshit higher-ups from Fullmetal Alchemist.
They believed in the spiel of Father, but even if it was a lie... they really justified their actions by saying that they were the chosen ones, and that they weren't killing people, they would "live on" inside them.
Ah, so it wasn’t just grown hair, she did grow taller. Either her hair grows really slowly, or she had it cut multiple times. I forget if she needs to eat. If she can manage one attempt per second, that’s almost 6 years worth. Depending on how much she can automate the attempts, that’s almost number could easily be orders of magnitude smaller or larger. Very hard to say either way.
Like Killy in the elevator for a few centuries in Blame.
1. Create a single superkid
2. Put kid under care of a robot it will grow attached to
3. Program the robot so that when the kid grows up it will kill itself potentially giving the kid lifelong trauma for their super duper important mission
4. ???
5. Profit!
Cormac McCarthy is the only one who correctly pointed out that after the apocalypse, no one goes to the dentist. It's not all cool robot fights or roving cannibal gangs fighting over gasoline.