It's not under eleven's football FFS, Pardew's job isn't to pick the kids who come to training most often and work the hardest.
If Ben Arfa was lazy on the pitch there'd be some merit to this business about him having to work harder, but we've seen no sign of that. I'm sure his attitude isn't perfect, it rarely is with flair players like him, but if he does the business on the pitch I couldn't give a shit if he half arses it in training, nobody gives a shit who wins the Monday morning five aside games.