It is quite impossible for the return of Maul. The core reactor would burn him to a crisp.
This gives me an idea. I could write some stuff, like write out a saber duel or something...
Maul dueling whoever would be great to see. Especially in my story that I've written. He nearly VERY nearly kills everyone until the main character gets some bright ideas.
but weve only seen jedi fight the vong. what if a full blown sith unleashes the power of the dark side on them, force lightning and all? maul could easily take two warriors, probably even more than that. ganner rhysode and anakin showed that if you use the force properly, you arent invincible, but you are pretty darn formidable. even against several opponents.