The positive is we won't lose these games as we will be able to win the ball back in our opponents half and counter attack with real pace. (justarsenal.com)
Only downside I see is he lacks real pace if left exposed and needing to defend well. (justarsenal.com)
I would seriously go with koscielny and debuchy at the back then add real pace on the flanks with bellerin and gibbs sitting behind Walcott and sanchez. (justarsenal.com)