Kante has shown to be injury prone since the Lampard era. Kovacic also has a chronic hamstring issue since 2 years ago.
Again, it is incredibly naïve to think they would all of a sudden not become injury prone anymore. It's also so blatantly obvious that when one of them aren't on the pitch, we struggle immensely. It's also evident that should be doing better than Jorginho.
Look at Saints second goal. Tell me if that would ever happen to Rodri, Fabinho, Bentacur, Casemiro, or Partey?