@Fire Fist:
the Millifiore family doesn't exist yet; Byakuran is 13 and powerless in this timeline thanks to Irie (also 13 in Present) time taking a different course of action. That's just showing all the powerful people in the series; if you look, Gingerbread is there, too, the guy Lal Mirch had a helluva time beating. Gamma is there, too.
Aria is the current Sky Pacifier holder, so she'll obviously have Gamma fight for her, or even Genkishi, who were both originally loyal members of the Giglio Nero family. (Gamma's already with her; in the Anime, he watches Aria behind the scenes while she administers a trial to Tsuna). Hibari knows who Fon is already, so it's a given Fon will choose him eventually. This was hinted back in the Future arc, where Hibari gives I-Pin a doll of Fon to her. They look almost exactly alike in Fon's adult form, so given that the true age of the Arcobaleno is mid 50's-60's in present time, Fon is probably Hibari's grandfather.
If Millefiore doesn't exist and Byakuran is powerless, who was it exactly who flew in through Yamamoto's window to heal him?