It is completely obvious that Nintendo had not thought of a Zelda Timeline when they started to make more than five games simply because of the fact they wanted to just focus more on gameplay. Which is completely fine because these games are not meant to tell the entire history of Hyrule; their just meant to tell the story of Link and his adventures throughout the land of Hyrule and his final fight with the evil Ganon, it's not like as if Zelda was all planned out like Lord of the Rings and what not where there has to be everything in the story to keep it going and that everything is straight-forward and easy to understand.
