I think he' just a bit of a dychotomy.......... Depending on the game and the oppo; sometimes wing, but in others that roaming R-MF role suits him well.
You can’t just roam about Willy fucking nilly when you are in midfield, that’s the problem with playing him there. If he’s going to roam, it does less tactical damage if he does it from RF, with a proper 8 to cover his meanderings.