It is true. Naoko Takeuchi was required to send a character sheet for the new seasons as well as to write the manga at the same time as a guide to adapt the 90s anime. Of course whether they used her ideas, altered, changed etc was to their own descretion
It is one of many possible futures but this is also the future they wish to happen. The fact that for one if something happens to either Mamoru or Usagi that could prevent Chibiusa from coming into being that she will disappear is proof of this. It is a closed loop for this future and the future they want to happen but if someone does something really bad or they fail etc then yes they will get another future but it isn't one that they want etc
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