We don't need the Big 3 to win, we need A Big 3 - it doesn't necessarily matter who, most of our Ws throughout the season one of the Big 3 struggled during the game, but Rondo, Perk, Powe, or whoever stepped up to pick up the load. As long as we have 3 guys (ideally 4) scoring and making plays we are golden.
Biggest candidates this game are Powe, Perkins, and House/Cassell, in that order I think. Posey is continually an X factor but we don't rely on his scoring.