>>11840953
>Ruto doesn't go anywhere near the boss room
She goes deeper into the temple and is not seen again until you beat the boss, after which she "awakens as a sage."
>Nabooru definitely isnt dead when you go to handle Twinrova
Kotake and Koume kill her right in front of you after the Iron Knuckle fight. You don't see her again until the Sacred Realm.