To be a good counter attacking team you need a solid base and a strong platform to work from in previous matches this season Koscienly and Mertesacker in particular have looked all over the place defensively but with the addition to Coquelin in recent weeks he's gave an aging Mertesacker that needed protection in front which has shown in Arsenals defensive performances of late. Not to mention the safety net
of there goalkeeper Ospina something that Szczesny didn't provide.
Now to the most important part goals now that Walcott's back , Giroud's and the return of Danny Welbeck i can see Arsenal finding some form. The healthy thing about this side is there is option for change and variation with plenty goals all over the pitch. If Ramsay can find his goal scoring form that he had at the start of the season i can see this Arsenal team going on a huge run.
But can Arsenal do it against the big sides? that's the question with Sanchez to come back there best player in my opinion i dont see why not.