manga said: And of course, the authors could have changed their minds.
That's my personal guess. Just because there do seem to be some mild inconsistencies here. Nothing overt- but just... I don't think Wendy would have written the story that way, especially that Blue Mountain scene, if she had planned that twist from the start. I think that was retroactively integrated.
On the other hand, throwing that idea in does not technically contract what came before. It's just mildly inconsistent. It's definitely something that can be rationalized.