@Zack:
The main thing that can be taken advantage at this rate I think is the simple fact that beyond healing Gon, Leorio really doesn't want to become chairman at the moment. If it's somehow revealed that Gon's healed, Leorio has absolutely no reason to become chairman since the sole motivation to become chairman is to take advantage of the position to help Gon.
He actually never had any motivation to become chairman. He just used the opportunity that speaking in front of the entire Hunter association gave him to ask for their help. Sure, he phrased his speech as if he were actually running, but that seemed to be more about getting swept up in the election and not knowing what to say. Remember, he hadn't been listening when cow-dude and Cheadle gave their speeches since he was too busy worrying about his own, so he had no idea Cheadle pretty much passed the buck to him. The whole part about him making the association his private property was to shock the audience into listening to him, and possibly to chase off anyone from actually voting for him. He doesn't really know what he's doing up on stage in front of everyone, and he doesn't really want to be there. But hey, captive audience!!!!
Anyway, I'm with kewl on the whole Illumi/Pariston thing. As in, there is no real evidence of anything. It's much more likely that Illumi was talking with Hisoka or Milluki (both of whom have been working with him throughout this arc; it was Milluki who was relaying the video feed from Tsubone's monocle). And like I said before, it seemed more like cow-dude and Cheadle were reacting to Pariston's Now I'm Serious mode rather than Alluka's power. If it actually was Alluka's power, wouldn't more people be reacting to it? At least some more of the zodiacs.