Playing Khusanov at centre half would fix that, it would cause some issues playing out as he’s not shown himself to be great at that, however, we saw with Reinjders at the CWC that he can drop right into the centre of defence to collect the ball and progress it forward, and Rodri can do this too.
I think this is the way forward.
Khusanov and Gvardiol are a well paced pair of centre halves, especially Khusanov as he’s rapid. Reinjders and Rodri drop in to help guard counters and in possession to build from the back.
We saw this tactic a lot with Bernardo and Kovacic towards the end of the season too, and it worked well in possession, just not when being countered.