I'm OK if he doesn't display emotion. Everyone is different that way. A quiet leader is often just what's needed.
I want to see him make smart basketball decisions. His shot has betrayed him for several weeks and he can't let that impact the rest of his game. He needs to be an example for the rest of the team in that regard because OSU makes too many silly plays (doubling the post off shooters, passing to the wing without looking to see if the guy is open) to win tough games.
For good or bad, it starts with him. They need him to be smart.