Much like Song?
Players' inclination to defend often changes upon the instructions of their managers. Yaya is a force of nature going forward, so he has been asked to focus on that. He's also a guy who has played central defense in the Champions League and acquitted himself favourably. He's still the best central midfielder in England.
Ramsey has 6 months of top, top form to his name. Yes, it's the best midfield play we have seen in the post-Vieira era. But it's still only 6 months. I'm looking forward to his continued development, but I'd like to think we are past that era of overrating our midfielders. Nobody at Arsenal is the best anything right now, but we have a good group of players