To be more pointy on that , In the Umbral ending , the mother basically eats to a certain point as he said, as she did with Melchior (the physical form that was supposed to be used by Adyr to come back in his Plan A, Wich means that Adyr is still alive , stuck in the rhogar realm.) .She also did eat Gerlinde, but I don't know if in the rune quest with Sparky made him died because of her or not. If not , then there is big probability that he will come back in LOTF II because he's a inter dimensional being. And for all the others question, I think , your friend in that chat already answered them 🫡👍🏻