Cazorla has been holding things together in midfield for weeks now. Ox always gives 100% too. TBH I don't think the not caring thing is real at all. I don't really rate Debuchy or Welbeck but I wouldn't put it down to them not caring. They just aren't that good. People seem to think Per doesn't care because he's cumbersome as shit.
The whole teams a mess. There is no balance to it, they're poorly coached and half them aren't 100% fit. They're either coming off an injury (Kos, Debuchy, etc) or they're in the red from playing non-stop (Sanchez, Welbeck, Per, etc)
In fact thats probably whats wrong with Per. Barely missed a game all last season, went to the World Cup, played basically every game this season bar the opener.