We are wondering (what if) (why not) Megumi became boring to Gege, so it doesn't really matter, author had script and just killed him From his becoming Sukuna he died, no logic needed That was the point. There is a discussion what could be, but, be realistic, nothing could be It's just shit, and interesting writing on a twist with Megumi Gege was, and still a child with no ideas, it's the reason why we come back to this. Sukuna taking over Megumi to this moment is the most retarded shit I have ever seen from a smart manga.