Board Thread:Theories and Speculation/@comment-27260817-20160203170532/@comment-25122992-20160206112134

Well, SPCT didn't just seal her, it drained all the chakra she had as well (which was then released as the Tailed Beasts). Naruto didn't have any chakra absorption skills, while those of Sasuke (Preta Path) were only developing at that moment, so, of cource, the only way for them to take down Kaguya was to seal her via SPCT. But Momoshiki had so impressive chakra drain abilities, that there was actually a possiblilty he could really absorb all of Kaguya's chakra. And Kaguya is still a humanoid being which obviously can die after losing all the chakra it had.