User blog comment:Derax-Pagani/Chapter 507: Voice/@comment-4933386-20161025091536/@comment-7418318-20161025110915

The problem I see with the experiment theories is the age.

We know of Erza's existence from the moment she saved Kagura and then the ToH, so any Irene experiment would have to take place before that time. That is very young to make such experiments, unless of course it was an experiment done to Irene rather than by Irene.