You're forgetting that Link had the Triforce Of Courage in the Adult Timeline and he was sent back with it to seperate the Triforce. Because Adult Zelda has the ToW and Ganondorf has the ToP in the Adult Timeline. Sending Link back into the Child Timeline would sort of split the Triforce up until it can be brought back together somehow.

And we see Link in the Master Sword area. Remember what started this all, the opening of the Door Of Time and Ganondorf entering the Sacred Realm via the open door. So Link could of been sent to the start of his journeys before he took hold of the Master Sword where the Door was open. He runs back to the Castle and tells Zelda what he sees in the future.