Agree with others that Graham is too young. He still needs to focus on being a consistently good footballer before taking captaincy of an AFL club on.
We are not in the window to have a skipper learn on the job as well. That can come in a few years.
Don't really get following the same script with him as Chimp. i.e. a young captain.
We are unlikely to see someone with Chimp's combination of maturity, football ability and leadership in our midst for quite some time. Let alone at the age he was showing it.
Unfair on Jack. Graham that is.
If he wants it - Dusty for Leysy. He really is a very good leader now and the responsibility might really invest him to elevate him and the team. Imagine him looking the team in the eye before the game to follow his lead...
If not, Grima.