Obertan gives us width, like, Ben Arfa won't stay out wide all game. However our chance creation is fucking horrible this season imo, we create maybe 2-3 clear cut chances a game but we've gotten away with it due to Ba having one of (if not the) best convertion rates in the league.
It's been said before but we've been pretty 'lucky' with a lot of points this season due to some fairly heroic last ditch defending and Tim Krul in goal, and I very much doubt we'd lose that if we play Ben Arfa ahead of Obertan, I do however think we'd score a fair few more.