im probably completely wrong as its been a while since i played FF7 or 10 so i cant remember the stories exactly, but seeing as they are set in the same universe and therefore follow the same rules (like the lifestream and farplane being the same thing) then wouldnt spira have its own version of the weapons from FF7? as in emerald, ruby etc.
also if this is the case, would you have expected them to wake up and just kill sin and vegnagun themselves?