Board Thread:Versus Debates/@comment-30355627-20161030163643/@comment-25122992-20161211134729

Not really, no, they just weren't aware of Shin's abilities and underrestimated him a bit, and Sasuke had some of his abilities restricted because of the excessive interdimensional travelling. Kurama himself said that a sword through the stomach was no danger for Naruto at all. Also, it's a bit of inconsistency in that moment, since Naruto's chakra cloak normally should've defended him from a simple sword.