User blog comment:Derax-Pagani/Chapter 507: Voice/@comment-4449950-20161028023156/@comment-7418318-20161028083441

Their personalities do match up pretty well, but there are that problems with Edolas-born Humans not having a magic container and them being stuck in a world without magic.

Neither is an insurmountable hurdle though. The gate (or anime) could have been opened from Earthland and sucked "Irene" through.

If the magic container is an actual physical organ, someone might have cut out another person's magic container and transplanted it into Knightwalker, leaving that big scar in the process. Hmm... maybe the experiement went even so far as to implant multiple magic containers, re-creating an effect similar to Second Origin.

But I doubt either will be the case, but if it is, Mashima had better explain why she changed her name, how exactly she became able to use magic and how and why she came to Earthland.