Agreed. Our CB's are hopefully out of form/bad these days, expect Süle who's doing a decent/good job. Hummels is a fantastic CB, but his second half of 2018 has been dreadful, Boateng is just washed up for good.
That's also why I hope we will do something in this coming window, like buying Hernandez. Not that it would solve everything, but it would be a start.
You got to give him props for the massive improvement in defensive stability. That was all he talked about pre game. And they conceded only 8 goals so far in league.