It’s definitely a valid argument given Vidal’s ability to play further forward. Muller’s position may be the most threatened but I don’t see it being a season of frustration for him. I think Guardiola values Muller quite a lot and he’ll have a serious task juggling all these players. I think Muller and Costa may be the starting wingers in any one of those positions as there is no certainty regarding the fitness of Robben. Costa can provide what’s missing when Robben’s not there and Muller can play on the right. Who knows though.