Iolite has been interesting. Because it's a sort of fractured team, it's actually pushed Neji to be more diplomatic. If he weren't, then they couldn't win, and that would be awful. :(

And actually the answers are related—first Vincent was kind of pushing Neji to take a more leadership-ish role in the team, with his guidance, and then Spitfire asked Neji if he thought he could learn how to juggle in Columbine's game. The two things sort of connected in Neji's head. The short version is that he experimented with seeing if he could juggle while he was thinking about Vincent and hiss Plans.