Board Thread:Naruto Discussions/@comment-30168027-20161007222916/@comment-3965545-20161030000227

His Chidori was not a normal Chidori, it was an enhanced version with explosive properties, made for situations like that it seems.

Also Hag literally said to the 4 edo kage that he gave Sasuke and Naruto each half of his chakra, therefor he needed the 4 edo kages chakra and the dead kages's chakra to summon them back from Kaguyas dimension.