Sun Demos was not the only one who complained to Michael. The Blood Oath Demon Monkey King was merely the first of his many subordinates.
Following Sun Demos' departure to act as the future guardian of his master's territory, complaints from the Lesser Elementals and the members of the Sacred Knight Temple reached Michael.
["The Lesser Elementals want to join the war in the Savannah Region. They heard about the heroic tales of their brethren and they desire to create their own heroic tales."] Zeroa informed him. She forwarded a few more comments from the Lesser Elementals, making it clear that the Elementals didn't want to rot away in their society underground. They wanted to help Michael and their Empress to protect and expand their territory, while also seeing the breathtaking scenery in the outside world.