Killua was scared shitless. I won't overly much blame Netero & Co for taking his words with a grain of salt. The world of nen is full of monsters, was even before these ants, and if you let them scare you, you have already lost a lot, like the arrogant dude said. It's a different thing letting fear help to better judge your options, that is, to be careful, but it's another thing if you start to view someone as impossible to defeat by anyone. If you don't believe you can defeat the opponent, your efficiency is sure to drop drastically.
Exactly. Though we have no reason to assume they'd have died, especially both of them. Like I've been saying since a couple of pages ago, Kite had been steadily underestimating the ants due to arrogance. That ended up compromising his own mission. Yes, the mission he deemed so important yet sacrificied to, possibly, save Gon & Killua. How is that not amateurish? He didn't go all out against the opponent, his intel was lacking yet that didn't make him more careful but careless instead, he didn't concentrate fully on the main objective, he got distracted, he got himself killed(?). An amateur if I have ever seen one.
I don't recall saying such a thing. I have only said Kite was a worse fighter than Spiders. Kite got defeated rather easily, it looks like, by Neferpitou, so there's plenty of gap between those two for all manner of power levels.
By results, perhaps? Sure, Neferpitou is strong, but I wouldn't put too much stock in the assessment of one kid scared witless. If Neferpitou ends up wiping its chitin ass with Netero & Gorillas, then sure, Killua happened to be right and that's it.