Kilbane realistically won't play all of the games. Thomas for the future but needs to learn his trade and will do that next to Kilbane. Wood not certain to stay, Sheffers not right for the job.
I'm not in the goalkeepers shouldn't be captains camp, so for me Murphy, who is likely to play every game, is not a new addition and is likely to stay if we achieve promotion, has an older head and I imagine the respect of his colleagues, would be the obvious choice.
Kilbane can show his leadership qualities in the middle and I would expect Shefferes to play on his experience up top.
Btw, I know there are examplets of keepers that it hasn't worked with. but both of the Euro 2012 final captains were keepers.