True, it is not. But since the Person/Sour Star/Illborn thing parallels Kingdom Hearts's Person/Heart/Heartless/Nobody thing, it made good example to illustrate with. I am not saying that it works exactly the same but I was using it to explain what I was thinking better since you seemed to misunderstand what I was saying.
You can say that about
some Warrens system and a system from
any game. It doesn't mean anything. Hell, you can say that it parallels the Passengers from
Worm, but you don't see me making Theorycrafting based on that, now do you?
We don't know that Riltia lost her Soul Star. She lost her Soul Charge which caused her to transform.
Her soul star was looked at. It was corrupted, damaged, distorted. It almost certainly didn't function as a Soul Star anymore; the only reason I say "almost" is because there might be some function other than those listed in the menu and whatnot that somehow managed to survive the corruption of everything else about it.
Because we were told by FFS that Willborn are specifically different from the standard Illborn. We have no reason to believe the siblings will become Willborn, because we don't know how a Willborn differs from a standard Illborn. There have been several theories, but none confirmed. So its is reasonable to think that siblings are as capable a turning into a non-Willborn Illborn.
And why would we assume that these non-Willborn Illborn are incapable of being monstrous, as you claimed?
We haven't been able to get that much information yet as the only two Willborn we have seen are the only two transformations we've seen. But we have seen many different standard Illborn both monstrous and (for lack of a better word) normal.
...which is evidence that Sibling Illborn
must be humanoid, how?
Are you saying that there is some reason that Cain wouldn't become a Hellyfish type Illborn? I am legitimately asking a question here, not Strawmanning. Like I said my theory is he wouldn't, but like you said I have no proof hence it's a theory. We have no idea if Cain satisfies any condition (to become Willborn or to become a nonmonstrous Illborn like Chief) so its all speculation.
Define "Hellyfish-type".
I never said to discount horribly monstrous Sibling Illborn because of Kingdom Hearts. I'm also thinking that Willborn will always look monstrous... judging from the fact that each character has a specific Willborn form and that Willborn are supposed to be a bad thing.
I just said that if a Sibling were to become a standard Illborn that I think they would possibly fulfill whatever condition keeps Chief in a non-monstrous form rather than turning into the monstrous Illborn we seen in the dungeon levels. I do know this doesn't have to be correct, so I'm not arguing this point simply explaining it. It seems from your replies that you misunderstood what I said.
Possibly? Yes. Your original statement made it sound like you were saying that
would be the case, however.
IF YOU HAVE NO PROOF THEN IT'S A HYPOTHESIS NOT A THEORY
/pedant
Yes, because we're following scientific procedures so much more than colloquial types of (semi-)educated guessing.