Thing is with FF7's weapons are they just going to use the ones from FF7 alone or the whole anthology, in which case Omega Weapon could be the final one. Of all the weapons that i am interested in fighting it is Sapphire Weapon i want to fight most since it was a glorified cutscene monster you had next to no interaction with it so the devs have near complete freedom with moves beyond it can swim and fires a laser from it's mouth. You at least fight all other weapons even if you didn't kill them(Diamond in international was fought)

Omega is not the Omega weapon they are separate entities within the series.