I think I was leaning on agreeing with you however, I think I am getting stalled by a couple of wrinkles here. Well one sort of big one. And partially because we don't have any other leads which is contributing to my further speculation.
And that specifically is the Moonshine videos. Like the person from those youtube videos, and those Moonshine ones has shown quite the vocal range. And you watch one Erina stream she'll be using her standard deep, breathy voice to a hyper chipmunky voice at random right. Certainly not proof by any means. But the DFE and Moonshine connection, I dunno.
Like how roundabout was the zoomer confirmation? How hard of a confirmation was it I wonder. We already have speculation that Gen 3 are all nepotism hires right. Invaders 2, all nepotism hires. Shiina apparently knew Airi, Dizzy knew Shiina and was even asked for her opinion during the hiring process. I dunno, perhaps they went elsewhere. Hell maybe they died, but I'm still a bit hung up on the Moonshine connection personally. It probably is a coincidence, but hell if there is anything I've learned this past year, especially when it comes to small corpos is that coincidences are rare and somehow everyone who is on the inside knows each other.
Of course with the hard doxes of Lia and Rie out there they more or less match what's on paper. But what if Erina is a mystery because she is a veteran and is well versed? Or could she be a Uruka situation where there just really isn't anything out there?