Chara is the captain and Bergy is the silent leader by example, but Lucic is clearly the heart of this team (you saw it clearly in game 7 vs Toronto. The whole team feeds off him). He should have the A full-time. I understood Ference wearing the A. Never understood Kelly. I always thought that was a Claude/Chia pick, not representative of what the players would choose.
I vote krejci. Only thing that might work against DK is that bergy and chara are both 'silent leaders' as I'd imagine krejci would be too... Wouldn't hurt to have a loud outspoken guy that isn't afraid to say what needs to be said (I can see lucic fitting that mold)