How is it in the child timeline dough? Ritos exist
Check the memory you get right in front of Hyrule Castle.
The memory is that of Zelda making Link the official knight for the Master Sword, and Zelda mentions this specifically:
"“Whether skyward bound, adrift in time, or steeped in the glowing embers of twilight…"
Too specific.
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If you've seen the first memory it says that the hero has went through the glowing embers of twilight (twilight princess) and for the rito it stated in hyrule historian that zoras evolve to Tito eventually. Of course there are still zorad but logically speaking their next in line to evolve
The Zoras and Rito coexisting is not an issue if we go by evolutionary science.
Going by Darwin's, we evolved from the monkeys, yet we coexist with them as well.
That is perfectly plausible.
Same goes for Koroks and Kokiris.
Although, Kokiris might have gone extinct since there is none by that point, nor any other since OoT in the Child's Timeline iirc.