I am sceptical as well. Elizabeth having a fight against her mother and being relevant contradicts Nakaba's writing
But if it's true and Zeldris becomes the DK at the end of this movie, my theory of Ominous Nebula being the key to defeat the Supreme Deity is becoming more and more true
I can accept Mel and Zel defeating the Supreme Deity if they bring out their Indura modes (seriously, another interesting concept that got completely dumped; we only saw Monspeet and Derieri's). Nakaba can make this really interesting if he wants to. I can bet my ass it's not gonna happen though.