Asmodeus was complaining that he didn't get the transformation, but even though he was an original sin, Asmodeus wasn't ready for the evolution.
That was why he had to wait a bit longer. He thought he could become a true demon god or something else, but he was disappointed for not being ready and let Brunhild take that spot.
Fortunately, Sera didn't care about demons or angels anymore. She embraced both of them equally, so it didn't matter even if Asmodeus remained as a demon god.
Anubis had gradually dropped that kind of thinking as well, but it was still hard to stomach when even Raphael became a Holy Spirit.
Nathan promised him that he would help him become a true god after reaching a certain phase. And it looked like Asmodeus was the one closest to it, so with an achievable requirement, Asmodeus put his complaint down.
