I don't know anything about 40k, but thanks to your fanfic, I researched a brief summary about this universe to accompany the MC. I'm really enjoying your writing. Well, I thank you for introducing me to this wonderful new universe.
Just saying what happened is not a nerf it's really doesn't make it true. Doesn't matter if he comes back more powerful. He was still sealed even knowing he was going to be betrayed. That was kind of disappointing.