I voted Smart of the options offered. Even before his shooting picked up a bit he was a natural and vocal leader around the team, almost from the point when he was picked. AB is a leader by example but Smart lets other players know he is there, his aggression towards the opposition also encourages more effort from team mates.
Smart, Crowder and AB can provide a core that the Celtics so called 'less than elite level players' use to over power elite level teams. Especially now Smart is becoming more consistent with his shooting. I think once AB is back this team gets even better and can 'overachieve' on their overachievements.
Got a bit off topic. Feeling positive about the Celtics right now, despite the loss today.