If he's your absolute top player and the medical advice is that he's definitely going to be fit, then yes. That's pretty obvious, isn't it, as is Oxlade-Chamberlain's peripheral role and uncertain medical prognosis. I'm not sure what your point is - Ron Greenwood was right to take a clearly unfit Kevin Keegan to the World Cup in Spain, Bobby Robson was right to take a crocked 'Captain Marvel' Bryan Robson to a World Cup, or Sven was right to take Rooney with his fractured metatarsal, etc etc? If that's your argument then I disagree and repeat the point you contested. The recent history of England at World Cups is littered with managers whose neurotic obsession with certain big players has caused them to waste a space in the squad.