Okay so another Scratcher gave me the idea that Hyrule Warriors rejoins the split in the timeline, but also I have completed the gameplay of Echoes of Wisdom and River Zora/Sea Zora begin on opposing sides, but both have good intentions. They are just two different subraces of the Zora. So, my theory is: Echoes of Wisdom falls right after Ocarina of Time, in the very start of the adult timeline. It has all three bosses in both EoW and OoT, which are Gohma, Volvagia, and Lord Jabu Jabu. In a game theory episode, they say that Windwaker seals off Ganon forever, just doesn't seal off evil forever (dark side of triforce, Lorule, etc.) But then that leads me to think that it goes after Windwaker, because in the start of EoW Link defeats Ganon.
Please, I need to figure out where it fits in the timeline. Comment on what you think of where it fits!