He's not a true leader, just because he's been the Celtic the longest doesn't mean he can lead. I see more leadership out of Smart than AB right now, and I wouldn't give him the C as of now.
I think Lee or IT may take that role this year.
Also, Stevens said his first year he didn't have Captians, they made him make Rondo one to keep the child with in happy. So he may not give the C to anyone unless it's some one really desirving, like our last one (not Rondo).