I broadened my perspective and noticed that, even if the final animation were to be rigged, how do you explain the last song was a new version of Triangler, where the lyrics were "whom do you kiss, me (Ranka) or me (Sheryl)?". If Alto made a choice, shouldn't we have a final song whose lyrics were something like "I love you, and only you"?
This is one of the things the movie should correct
Why, haven't you seen the real ending of Escaflowne?
Maybe that was the reason why there was a similar color scheme in Bilra's Skull Squadron, and why he had so much trust in Alto
More exactly, places where people lived without implants. She never meant to kill all humanity.
FV