I will end by point about Uvo by saying this: Getting dragged into a one-on-one confrontation with Kurapika (the guy who demonstrated the ability to restrain him without much effort) because of his damaged pride was not smart. As such, it shows that even the spiders are prone to things getting in the way of their better judgement. Even if Uvo was happy with his decision, it doesn't make it any better. Had he been more patient, things probably wouldn't have turned out so badly for both himself and the rest of his troupe. Also, if there is doubt as to whether or not he played right into Kurapika's hands and this was also a trap, I would refer you to Kurapika's speech at the end of the fight where he explains why he targeted Uvo and how he expected things to turn out. Uvo showing up all alone to challenge him to a duel was pretty much the ideal situation he could have hoped for and gave him the perfect avenue to test the assumptions about his powers as well as take out the strongest fighter type in the troupe. It has been stated several times that in a nen battle, information about your opponent can be everything. Clearly, Kurapika seemed to know more about Uvo than vice versa. Yet Uvo deliberately walked into an unfavorable situation all on his own. It was a mistake the Spiders sought not to repeat when they decided to travel in pairs when hunting down the chain user. Furthermore, they made collecting more information on the chain user their first priority.
Kite had no way of knowing that there was nothing that could get in his way, or that none of the royal guards had hatched. The only thing he did know was that they were capable of taking out a nen user like Pokkle at the very least. Going in gung-ho could have very well worked out coincidentally, but it would have been a reckless decision to make, given his limited understanding of the situation. I cannot fault him one bit for proceeding more cautiously (and consequently slowly). In order to figure out what was going on, there was nothing wrong with targeting ants that had strayed away from their nest and scouting at the perimeter of the nest using his long range En. This and locating the nest is what he spent most of his time on anyways.And no, there's nothing at all the nenless grunts could have done to stop him, even if they had attacked all at once. We already saw that. This royal guard was the only thing that could stop him, so he should have hurried. They were only a single day late. He knew they must hurry (although he didn't know the details), yet they didn't.
This is still a bit hard to speculate about. It all depends on whether Pitou would have still decided to mind probe Pokkle. Peggy was investigating invisible bullets at the very least, and Zazan talked about special humans being different. Had Pitou still ended up getting the information from Pokkle, the situation with Rammot would have been largely inconsequential.