Nerfed him a bit, playing with Bender wont make him a better CB. Bender is too fucking inconsistent, he make sweet coverings and pokes in one ame and in minutes later he just wont be useful defending, he is just a mixture of good/bad defending all in one match and among a lot of games. So Tah gets frustrated playing with Bender so that clumsiness gets spread and he gets prone to mistakes as well. Both are fucking uncordinated, they just doesnt work are a CB duo so thats the reason behind Leverkusens defensive problems.
Leverkusen is a nice attacking team, they have players who can resolve a game for sure but in the back they have serious problems. Honestly i don't know they they diddnt hire a better CB instead of keep believing that these two guys can work together.