This may affect how Kirk plays in the game and that is why he is concerned.

I thought it was stupid at first that Kirk mentioned how sweaty the new center's butt is. I said to myself, why are you talking about this. Then, I knew. He is trying to embarass the rookie, and trying to lighten things up for the new season. I think most of the pressure is on him. He has to become more of a leader and he has to take the reigns of the team and drive, so to speak.