Sorry for the delay in responding to this, Mikko - I kinda got distracted by going insane talking to Firemage and then got caught up with work.
I have a digital copy of the issue in question that I bought back when I was still thinking way too much about Endwalker. Here's the exact quote I was thinking of that led me to believe the ultimate antagonist was undecided at time, with a translation into English. I can give you a bigger dump of the raw text if you'd like to look at it more yourself. Note that this part of the conversation is while they're talking about being on the writers retreat.
Quote:
ィアークという名前が出てきた以上、 誰もが「戦ろうな」とイメージする部分があったと思います。 それをストレートに表現していくのか、 もしくはどちらかが片方を乗っ取って合体したようなも現れるという予想外の展開をやるのかと、いろいろと意見が出ました。 最終的にはストレートな方向にして、ラスボスは別にいるという形にしました
So in context, it seems like they were saying that it wasn't yet set in stone to have a separate final boss, and "final boss" (ラスボス) in terms of RPG stories in Japan has a connotation of 'ultimate enemy' that it doesn't quite in English (incidentally, this is why you see a lot of terrible isekais with "last/final boss" in the title), though I guess it's impossible to say for certain whether they would be actual villains. Later on, Yoshi-P says something along the lines of "everyone at the retreat agreed that these two aren't final boss material!" Regardless, this is just my interpretation.Quote:
I think that everyone assumed that both Zodiark and Hydaelyn would be fought. There were various opinions as to whether to express this in a straightforward manner or to take an unexpected turn by having one of them take over the other and become some merged entity. In the end, we decided to go in the expected direction and then have a separate final boss.
Anyway, I think I was thinking of this one when I talked about the concept of Dynamis not having been conceptualized until 6.0, where that's stated explicitly. There's another one where they talk about how they hadn't decided definitively if Venat was Hydaelyn or if it would be a bait-and-switch when they were first introduced that I'm trying to track down now too. Of course none of this is really says anything about how they planned the Sundering scenario specifically, just that there were lot of similar decisions they hadn't made yet - that could just as well have been the one thing they went in sure of from the start.
