Who says the Zoras evolved into the Rito over time? Or the Kokiri into Koroks? I don't think it's fair to rule out miraculous transformations. After all, Valoo gave the Rito their wings. They didn't 'evolve' them over time.no. kokiri can't transform. if you are relating this to WW, then the kokiri did not transform into the tree people, they evolved over time. Just like the zoras and rito.
There is no evidence Ruto became a Sage in the Child Timeline. As far as we are concerned, this sages were not the ones in the Adult Timeline. At the end we lack sufficient evidence to support the idea Ruti was the Water Sage that Ganondorf killed.Ruto was killed when they tried to seal Gannondorf in the Twilight Realm