Tough question IMO, getting the 'balance'right ie blend of experience, forwards / backs / mids., as well as genuime leadership qualities on and off the field
At this stage I would go for:
1. Miller ©, His time may have come. My gut feeling is that the players look up to him as a leader. I think he will thrive on the responsibility, and could be a 5 year captain.
2. Green (co. VC), hard to go past the on-field example he has set this year.
3. McLean (co VC), likely captain-in-waiting, but needs to serve out his apprenticeship without further indescretions.
Then it gets really hard IMO.
4. Rivers, with fingers crossed that he can stay on the park.
5. Moloney. Bleeds for the Club, and Bails said in a recent interview that he has been fantastic working with the youngsters in an off-field capacity.
Apologies: JMac and Bruce. Time to make way for some younger blood, and as has been said by others, they don't need formal leadership responsibilities to be leaders.