Defensively, things get much more dire for Borussia Dortmund. While last season, the Black and Yellows had the fifth best defence, conceding 44 goals from 43 xGA, this season they are on pace to concede just under 60 xGA and only Gregor Kobel’s unreal form has saved them for a much worse position in the table.
Borussia Dortmund managed to keep the same backline over the summer bar Raphael Guerriero, who was replaced by Remy Bensabaini. So such a stark difference cannot be down to just personnel changes.
While Jude Bellingham and Raphael Guerreiro provided much more control in terms of possession, there is no reason Borussia Dortmund should not be performing better. These repeatted issues have been demonstrated specifically in the case of Mats Hummels, who has given away penalties against Hoffenheim and Union Berlin in addition to his red card against RB Leipzig.
Each instance saw him forced to make a challenge against players in behind. While Hummels should know better than to act so rashly, no defender should consistently be put in high risk scenarios meaning things are likely to go poorly.