User blog comment:Derax-Pagani/Chapter 507: Voice/@comment-208.54.4.151-20161024175402

Maybe Ezra split into two during the time that she was inside the lacrima that was the Tower of Heaven. I mean there never was an explanation as to how she managed to survive. Her body was supposed to be broken down at the structural level or something like that. It may be possible that Irene was somehow "born" from that incident.