There is minute detail about changing the past from 1.0 that might come up. Or not, but here is the thing.

Back in 1.0, when meeting Minfilia for the first time, we got an echo vision. Normally, during an Echo vision all we do is watch and witness, however during this particular instance Minfilia felt us and saw us.

Perhaps in this way we can alter the past a little. It would take several people very skilled with the echo to pull off but it’s a possibility. Small possibility, but it’s fun to speculate.

I don’t know, just throwing out ideas.