Meruem blitzes and eats. Cheetu statues the fastest characters in JJK, characters like Knuckle, Shoot, and Morel, who can barely battle the RG scale to him so its basically, Cheetu=CA Raid Hunters < RG < Meruem.
Meruem also scales to higher biggatons even without Rage bomb, Cleave, Dismantle, and Kamino won't have enough power to do anything more than scratch him, World Slash is useless cause unlike Gojo, Meruem can regenerate.
So the King of Curses gets devoured himself.