I don't think the whole World Cup can rely on Theo Walcott but he can certainly come on and make a difference - and why not start him in a game or two? He is an interesting weapon because he can play wide and centrally. Then, once he is in front of the defender, nobody can catch him. He is a fantastic prospect.
I trained with the lad last season at Southampton for two or three weeks. In all the years I played there was never anything I saw on a training pitch that took my breath away, but he was doing things on the pitch that made me stand up and say 'Wow'. He could go on and make a better player than Wayne Rooney.