Would be a war. Wouldn't last long, though. I don't think Jr would handle Pavlik's right hands too well and he'd go down in 7 rounds I think.
There's nothing i've seen of Chavez yet that would make me pick him over Pavlik, but stylewise it makes for a good fight.
Kelly would whup Chavez so bad he'd end up on wigan undercards fighting bangladeshi shelf stackers for Harooooon!