Bellingham for Gundogan I agree with.
But Kovacic is in no way a replacement for Bernardo, in style, ability, or output. They are very different players that contribute very different things. Kovacic is never going to be playing RW or AM, for instance.
I have no doubt that Pep will make him a better player and he will perform better than in the current Chelsea team, but asserting that Kovacic is a replacement for Bernardo (or even that combined with Bellingham he will help replace Bernardo’s contributions) is just demonstratively wrong.
Now, if the argument is that we can play in a different way with Kovacic that will allow us to mitigate the loss of what Bernardo gave us, then I can get behind that. That I believe Pep can do.