Taranto time, if Dusty doesn't want it. Personally I'd love to see Dusty finish his career as skipper, but understand if it isn't his thing.
Baker is a great gutsy little player but I'm not sure that makes him a skipper.
Grimes and Nank are done as captains I reckon, and I've never liked the co-captain model, especially when both are injury prone and down on form. Sometimes the co-captain thing works when an older skipper is mentoring a younger one, but I don't see the point otherwise.