I think Togashi's going with the idea, that if these ants become more human and have the ability to tap into their emotions, they'll become much more dangerous. Yupi, and the King are prime examples.
I mean, the king intimidated Killua's parents, who I might even assume are stronger than the head of the Hunter association right now (he said he's not the world's strongest anymore).
but that's pure speculation, I really hope Togashi leaves us with a nail biting cliff hanger.
As for the latest chapter, I can't blame knuckle… but jeez. But Yupi and Pufu aren't gonna do crap, except get owned or sent away. Since the head can probably own the two of them.
I have to wonder, though, just exactly how much stronger Gon is. Can he even take on Pitou?