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Here Shikaku states that the speciality of the three clans (Yamanaka, Nara, Akimichi) is to block. The only thing is they don't have enough chakra to hold the juubi down.
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Here he asks Kakashi about the fights up till now.
I think that Kurama will end up giving Shikamaru and maybe Choji and Ino chakra so that the Ino-Shika-Cho formation will work.
These links certainly aren't proof that it will happen that way but that is what I thought when I read this issue.