I always had this cool idea that with the Simon Famiglia's status of being incredibly weak and their fall, the last few children of the family would be spread out and coincidentally the wielder of the Flame of Earth would become a guardian to the next Vongola boss in hopes of bringing the families back together as allies, and bring glory back to his family. Which can work since Lambo, the last lightning guardian, was also from another family. Also could still be Lightning Guardian though I'd make him go full on Earth Flame later when he can unlock the seal on the ring that keeps his full power constrained. It is just a thought though that I think could work well. Plus possible for the rIng fusion of Sky and Earth later for a cool moment.