Kandairu wasn't easier than the ant king. Jinwoo mopped the ant king and had to push hard vs kandairu.

Not having the demon monarch, even though he was a simulation, is wild. He was far harder than the punching bag Hwang Dongsoo. Dongsoo was boosted S-Rank, yes, but the simulated demon monarch would have destroyed him in an instant. I'd put dongsoo on Goto's level.