I think you can make a pretty good case that Brown deserves a nod more than anyone else on the C's this year. If Kemba is having a better offensive year, its not by much. He's shooting a few of shots more, he's been money at the line, and averaging 3 more pts per game. He does take primary responsibility for the 4th quarter and has mostly come through, so he gets props for that, but I'm not sure we wouldn't be better off moving the ball more.
While Kemba has been pretty solid as a defender too, there isn't much comparison with Brown.
Hayward deserved consideration too, but obviously being out for 6 weeks won't make it likely, and Tatum just hasn't been as good either.