Board Thread:Theories and Speculation/@comment-36649908-20180820043658/@comment-4080775-20180827223655

Kawaki was shocked, but that doesn't mean he didn't know about Tailed Beasts or Jinchuriki. I mean, everyone else knows of TB and Jinchuriki and they also know none of the past ones can even compare to Naruto. If anything, he was in shock of the form Naruto used and sheer chakra he displayed.