Actually, something that I called maybe right now it goes different scenario, without Nozel appear, but still it's gonna work.
Megicula is not the villain that anyone will be able to handle right now. I'm pretty sure that soon we will see her phase 3, where she obtained full power body. Which will turn her into main villain of this arc. This is actually good decision, case it will hype Lucifero for future arcs. Which means that Megicula's power will be overwhelming in all terms, so if that was Lucifero, they all will be dead.
Again my bet is on Asta being overpowered by Megicula, maybe even at phase 2, so till phase 3 begins much more characters will join the fight. That including Nozel and Yuno too. So third phase will be every one vs Megicula. I'm pretty sure that in phase 3 we will see Noel, Asta and Yuno vs Megicula.