Miyamoto: Well, wait, which point does the hundred years start from?
Aonuma: From the end.
Miyamoto: No, I mean, as a child or as a...
Aonuma: Oh, right, let me elaborate on that. Ocarina of Time basically has two endings of sorts; one has Link as a child and the other has him as an adult. This game, The Wind Waker, takes place a hundred years after the adult Link defeats Ganon at the end of Ocarina.
Miyamoto: This is pretty confusing for us, too. (laughs) So be careful.
Aonuma was just going to say 'From the end.' It was actually Miyamoto who mentioned that there was 2 endings. Aonuma just explained it. so if both the producer/creater of the game and the director agree then it's canon.
Plus even if they hadn't said anything it is practically confirmed by a ton of things in the games, specially in WW and TP backstories. Though good try for trying to come up with a theory that is different from the majority. Better luck next time.