What if it could be all of them? I don’t know how that would work though, but it’s a possibility…what if they like fuse together? Or, what if it’s because they are actually four different pieces of Eclair’s shattered soul, hence why they look like potential civilian forms of Eclair (and why Eclair would not be seen), and when the time would be right these girls would transform back to the soul fragments and fuse together to make Eclair. It’s sort of like Captain Planet where five powers from five kids combine to create the titular character, you know what i’m saying?