ah, that makes sense.

interviews and solicits have specifically stated that it's the former generation x character.

After both Monet and the twins were freed, the body still existed and had its own consciousness, we just don't know who or what it is(could even be a memory type consciousness from having three mutants with concept-based powers living in it) even before that, though, Emplate referred to Penance as a husk that he had put Monet in.