This is the way I see the battle going:
-Sasuke attempts to blitz either Hidan or Kakuzu with a lightning sword strike. If it's Hidan, he gets cut in half, Kakuzu counterattacks Sasuke very quickly, but Sasuke gets away, then Kakuzu stitches Hidan back together. If it's Kakuzu, he comes back to life with another of his hearts, and Hidan counterattacks very quickly and almost kills Sasuke at close range, but Sasuke gets away.
-Some initial skirmishing. Kakuzu launches a bunch of threads at Hebi. Sasuke cuts them off with Chidori Nagashi.
-Hidan gets double teamed by Suigetsu and Jugo, while Sasuke holds off Kakuzu in CQC. Kakuzu hurls him away and gets his masks out.
-Attacks with lightning mask, only for Sasuke to channel it away with chidori. Kakuzu attacks again with wind mask, except it gets repelled by Sasuke's katon.
-By now, Jugo and Suigetsu have defeated Hidan and they come to assist Sasuke.
-Kakuzu launches his huge fire + wind combo to defeat the four
-Sasuke summons Manda and controls him with genjutsu to serve as a meat shield. Manda dies
-All the heat that Kakuzu released into the sky creates a thunderstorm, and Sasuke uses Kirin on him
-Another one of the masks crawl into Kakuzu, reviving him
Now, at this point Sasuke is probably is exhausted. If a battle-worn Sasuke, Suigetsu, and Jugo can take out Kakuzu's remaining 3-4 masks they win. However, I don't think that's likely.
And obviously the battle won't go exactly like this, I'm just being imaginitive right now and like the idea of a slowly escalating battle *_*