It was interesting to note that yesterday RB Leipzig, (who play 3-4-2-1 formation that I think clearly indicates that Nagelsmann is a student of the Mick McCarthy way of playing) opted for a winger and a defensive midfielder as their 2 wing backs - and had 2 fullbacks and one centre back in the back 3.
Fair enough that didn't work for them either, but I think it shows the opposite end of whatever spectrum starts with us having 4 centre backs on the pitch + whatever Sang is and ends with their 1 centre back and 2 full backs.