Well Yumigahama is certainly alive and kicking. I would assume that at least some of the other fighters there are weaker than him though of course, it's no real reason to panic; after all, not every Kengan fighters will have the same level of strength as Misasa, and Purgatory has managed to win some of its matches. If a fighter wasn't confident in his strength and wasn't unfazed by this, it would be weirder.
Now, Naidan whipering something and then revealing moments later that he's part of Worm really shows that a lot of fighters in Purgatory are involved. I mean, we already know of another one too.
I'm confused about what Naidan is planning. Why does he want to fight Gaoh? In this setting, he can't kill him without forfeiting the match. Now to be fair, he may be entirely willing to proceed with killing Gaoh at the cost of Purgatory losing one match and leave the rest to the other fighters. Perhaps his plan is that, since Gaoh may be unwilling to kill him in this setting, it is the perfect opportunity to get rid of him since he will have no qualms. Yeah, I guess that once again, Gaoh is facing something who intends on killing him. That'll be interesting to watch.
@humbleoverlord
Gaoh didn't consider the Worm's agents to be human and killed them without a second thought. Koga couldn't stomach murder and while he didn't understand the circumstance, it's only natural. It's entirely true that it is abnormal to view killing other humans as normal in modern society. There's nothing cringe about that.