User blog comment:Neetaku/A Rewrite of Attack on Titan/@comment-35417358-20180215015425/@comment-24407809-20180215043539

I would if I could, but there's no place for them in the story after the 57th expedition. Their deaths were pretty integral to that story arc (unlike the 104th trainees' deaths), so there's not really a way to work around it.

That said, I'd probably add in an extra story arc set during Eren's time as a trainees focusing on the Survey Corps, and its expeditions following the fall of Wall Maria. That way squad Levi could be introduced, and have their own arc to make themselves relevant, so that when they eventually meet up with Eren, their deaths are a lot more unexpected (since they are legitimate characters at this point, and not just plot devices).