Wenger puts Ramsey out on the right wing for the collective benefit, because we have inexperienced or defensively suspect rightbacks, and because with Coquelin and Özil as fixtures in the selection, Cazorla in mid and Ramsey out wide has been much superior to Ramsey in mid and Cazorla out wide.
The use of Ramsey on the wing is a shame for Ramsey himself, but it's benefited the team on a lot of occasions. Now with Coquelin injured, the situation in midfield has become sufficiently dire you'd think moving Ramsey to centre mid would be a logical step. Against that logic, we also have an injury problem on the right side with Walcott out and Campbell and Ox still problematic selections.