Look, the biggest thing that McCullum has going for him as against the likes of Peter Moores and Chris Silverwood is that noone is going to look at him/listen to him in the dressing room and think "what has this bloke ever achieved?" That will mean that when he tries to influence the team culture and get players to make the little shifts, often in mindset at this level, they will be inclined to listen and engage - we're talking little things like getting the top order players like Sibley to be a bit more proactive rotating the strike.