Maybe that.
But you´re forgetting about a more fucked up explanation for why Priscilla´s "ghost" showed up here. That organization guy explicitly said "she´s beyond an abyssal being". What does that even mean? Imo, it makes little sense to say something like that if all you´re trying to tell is "she´s even stronger".
We had Youma, we have Awakened Beings, and we had Abyssal Beings. Each being significantly evolved from the prior. Last time we saw Claire and Priscilla, "something" did happen to them. My out-of-leftfield assumption is that Priscilla indeed evolved into an even higher stage of a Youma. And part of her newly gained abilities is to connect to other Youma. I mean, if I remember correctly, her and Claire mixed into some kind of weird, giant cocoon. Wouldn´t surprise me if that is now the Youma-analogy to a server, with other Youma being clients that Priscilla is able to connect to.
Of course, that´s all just wild interpretation and guessing on my part. Your theory is probably right![]()