Also, Madelyne was a clone made by Sinister, while JeanPhoenix was an exact duplicate of Jean that was born from the Phoenix, something that Jean has experienced more than one time in her life. I think those differences are compelling, it's like, the Laura Kinney who died at the Vault is the same Laura Kinney we see today (who has a new duplicated body) but without an specific part of her memories, but no one can say that she and Gabby are the same and that Gabby's experiences are Laura's right? I think the same can be applied to Jean, PhoenixJean and Madelyne. This is just my approximation tho, as I said this story is convulted lol. But I personally consider the events of the Phoenix saga, Jean's; and Maddy a separate person, who owns her separate history.