Perhaps that is what Proteus lends to the process, since, really, he's not necessary. (Essex was doing the cloning *by himself* and any telepath should be able to handle the mind-download. And Apocalypse had the same tech, he used to resurrect people like his Dark Riders, back in the day. 'The Five' are kind of superfluous.) Using a mutant whose powers explicitly affect souls, like Wycked, might have made more sense, but since Momma Moira's got her fingerprints all over Krakoa, there's gotta be a place for her special boy...
Good news, X-Corp has not been canceled, the creative team will be announced soon according to Hickman