oi! if anyone even dare to consider c.ronaldo as captain, there must be something wrong with his brains. right now his game is still too selfish at times and although i must say that it is his 'individual' performance at times that change the outcome of the game. but as a leader? now way! maybe another 5-7 years of maturity then maybe yes.
but if u look at another different teams like arsenal fabregas is qualified to be a leader though he is stil young he could lead his team and could influence the team performance.
jus my 2 cents