You do realize that Aoi is probably smart enough to get Idate to meet at a secret spot, like whta Mizuki did with Naruto. It was only by chance that Iruka found Naruto first. Also, nobody else could find the three, so through this logic, Aoi and Idate met at a secret location where the hunters cannot find them easily.

To Knives, you most likely forgot about the poison in the needles. Although Naruto's team was struck by them also, they were much less affected since they took the antidote way before Idate did. Not to mention the fact that Idate was hit by those needles way before the team did.