Coco: Who out of Koscielny, Vermaelen and Mertesacker ?

The centre-back position in this Arsenal team has been its Achilles heel for some time now, but the timely return of Thomas Vermaelen to the team has brought a measure of solidity to our backline. Vermaelen is regarded by most as our best centre-back. But Laurent Koscielny has improved in leaps and bound this season [...]