It is entirely possible that the Rito had someone important named something similar to Medoh in this timeline. The reason why the Ruto stuff is important is because it gives us a lot more than just a name. It confirms that the events of OoT occured in this timeline, which did not occur in Child Timeline.
Well, another one of the monuments mentions that Zora's Domain was established 10,000 years ago. We know that Ganon was dormant that entire 10,000 years and Ruto's Zora's Domain had to have been a different place because her story took place long before the 10,000 years ago. Wind Waker never touched upon the aftermath of what happened to the Zoras after Ganondorf froze Zora's Domain since the whole of Hyrule was wiped out, but Downfall makes it pretty clear that Zora's Domain never recovered. So that leaves room for a the new Zora's Domain to be established 10,000 years ago in BotW. In Child Timeline, Zora's Domain never gets attacked and is perfectly fine in Twilight Princess.
I maintain that the actual Triforce never actually appears in BotW. Zelda's power is the goddess power of Hylia, which every Zelda has had and never involved having the Triforce. A Triforce mark does appear when she uses this power, but glowing Triforce marks have been fairly abundant in the series without representing the actual Triforce. In all past games involving the actual triforce, once the whole Triforce is completed it exists out in the world as a solid 3D object that one must touch in order to wish upon. But the power Zelda uses is just an energy blast with a flat Triforce mark.
