Actually, at the time of Ocarina of Time, there was a timeline. It went like this:
OoT--ALttP/LA--LoZ/AoL
Oh goodness. >_< I meant that there was no Adult Timeline. There was a single Child Timeline, and what existed of the Adult Timeline wasn't really a timeline. You could have argued at the time whether the Child Ending or Adult Ending of
Ocarina of Time is what "actually happens," ala which timeline the 2D games go on, but given that both
Ocarina of Time and
Majora's Mask conclude on the Child Timeline, it would have made more sense that the Child Ending is what "actually happens." The fact that
Twilight Princess now requires that
A Link to the Past go later on the Child Timeline only confirms that arguing that way at that point would have been a correct interpretation of
Ocarina of Time's story, and by extension the way Nintendo wrote the story
at the time of its release.
Deniro, you're right that the Seal War does not need to be depicted directly in a game. When they did that with
Ocarina of Time they decided they had to make that an alternate version of the Seal War because it involved a hero, thus altering the location of the Triforce pieces and the circumstances of Ganondorf's sealing. The most direct possible depiction of the Seal War as it's told in
A Link to the Past would have to be a spin-off because it cannot involve a hero (in other words, a Link).
Another thing, Deniro, I can't agree with your assertion that the NES games go at the beginning of the timeline, before the Triforce is put in the Sacred Realm. The Triforce is in the Sacred Realm in
Ocarina of Time and
A Link to the Past (until a certain point in each story, of course) because that's where the Goddesses left it when they created Hyrule. This is seemingly contradicted by
Twilight Princess, but I could explain why the Triforce pieces' appearance there makes sense and does not contradict
A Link to the Past, but I won't take the space to elaborate on my theory here.
This thread is supposed to be about how set-in-stone the games are chronologically when they're made, and my position on that is that in relation to the existing fiction they are completely set in stone chronologically, but by the nature of the timeline debate we do not necessarily know what that stone in which they're set looks like - it's in the hands of Nintendo, but they've decided not to show it to us, and it's our job as fans to figure out what that stone must look like (assuming we're interested enough in the overarching story).