Cassandra Nova will join Marauders
That Ernst IS Cassandra Nova, was made 100% clear by Morrison. Ernst is the mindwiped Cassandra Nova Mumudrai in the synthetic body of a Shi Ar imperial guard shapeshifter (Emma tricked Cassandra into possessing that body).
The possibility that Ernst isn't actually like any other "mutant" was left open as recently as Spiderman and the X-Men
I know Whedon had a story about the stealing of the Cassandra Nova body, but Cassandra isn't in her body, she is in a synthetic shi ar shapeshifter body.
Do you expect any Marvel writer to touch this? or will it be completely ignored?
Ernst has been completely in limbo the whole Krakoa period, even though Martha/No Girl has appeared many times. Perhaps it was deliberate.
I created this thread hoping some Marvel writer or editor lurking this board will see this. Even if it's delusional.