Well we never know I mean we did see Nanamo die in front of our eyes but nooo she still lives... So its possible for Lahabrea to have stayed alive...However has anyone ever thought that maybe Elidibus isn't who he says he is..I mean he talked bout how balanced must be restored and how the mortals action are helping the awakening or rejoining or whatever it was called - He also spoke to Urianger and told him how they need to work together to save this star and this is just a Theory but he might be the kid who we talked to in Waking sands before doing Bismark EX in disguise..