I think he needs these 3 to fight off other Akatsuki whilst he fights Itachi. They're all gonna want to protect Itachi cos they can't afford to lose more members. Like Sasuke said he has a certain goal to carry out and it'll be much more efficient if he were to do it with a full platoon. But the theory mentioned above about capturing Naruto to lure out Itachi was a good one. It'd make sense to have Karin against Sakura, Juugo against Sai and Suigetsu against Yamato or Kakashi. I think it'd be nice to see Kakashi go off against Zabuza's sword again =]
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