Killua's families just have Ki blasts lol. I like the downside of Chrollo's specialist nen ability is that he needs the book open to use copied abilities.
It seems Silva fought Chrollo once before, probably back when he killed that Troupe member before. Anyway, this is another good indicator of what a true Nen battle is like.
So silva and kuroro had a fight in the past already. Theoretically this means that until now kuroro has at least doubled his power since he's able to fight against two of those formidable opponents right now.