Slow centre backs in possession-oriented teams are always going to get into trouble on occasion. You can't control a game without playing a defensive line that, on occasion, compromises your defenders.
The problem is when you're a defender that's slow AND 'front-footed', like Mustafi. Sokratis, in contrast, knows his limits, as I think does Holding. And they defend accordingly.
What made Kosceilny world class was that he had that Keown-esque 'rash' like inclination to chase down attackers, but also had the pace to recover if he got himself into trouble.
"Front-footed"; I like that.
Still, it's the manager's job to put it right, on the training ground, to ensure that it is not exposed so often. No players are perfect but you cannot allow the team to be scuppered by the shortcomings of its constituent individuals.
"Plenty of strikers can score goals," he said, gesturing to the famous old stands casting shadows around us.
"But a lot have found it difficult wearing the number 9 shirt for The Arsenal."