Yep, that's why the majority of the goals we conceded this season came from Mangala's left side of the defence. Just ask Victor Moses and Glenn Murray, both granted time and space to pick out the bottom corner from 20 yards by that clown.
He's a shambles and that's why the coaching and technical staff at the club were willing to let him go to Valencia on loan.
Kompany hasn't been able to relax in the knowledge that his defensive partner won't go walk about since Lescott, so having Otamendi in the team is a godsend.
Otamendi is an aggressive defender, but his starting position is always deep and he attacks the ball in to out, whereas Mangala and Demichelis will literally run around in circles and leave huge gaps to be exploited in our defence. That's had a hugely detrimental effect on VK's game.
Kolarov's exposed far less with a proper defender who reads the game well next to him as well.