"It is "white" basketball: jagged sweaty, stumbling, intense. A "black" player overcomes an obstacle with finesse and body control; a "white" player reacts by outrunning or outpowering the obstacle..."

I don't think I'd agree with that generalization. I've seen a number of White players who were graceful, making good use of small spaces with great finesse. For that matter I have watched many a White player whose face doesn't reflect his effort or successful move. In play, deadpan faces are common- kind of the way a musician can go inside him or herself.