A captain should be the one the rest of the players look up to. Luiz has got the passion for the role but he shouldn't rant at the referee - especially over something so trivial as a throw-in. The captain is the peace-maker between the team and the ref. It may have been the tipping point of a number of decisions but it was not a good example from Luiz. At this moment, I don't think anyone is a good fit to take over captaincy from the old guard but remember though, Luiz, Mata, Hazard, Azpilicueta etc have not been here long. Things could change in a year