We had Nat & Kabak sat on the bench....& Fab was being partnered with Williams or goes know who.Of course removing Fabs from midfield hurt us - but as you said we didn't have any CBs and Fabs indisputably played well there.
Wouldv'e even rather seen Davies play CB so long it meant Fab being moved back.
Everyone was calling for Nat and Kabak to start games earlier & for Fab to move back into DM. Klopp made the move eventually and it worked.