Lost in the midst, perhaps, of North Carolina getting revenge at the expense of their hated rivals, Duke, on Saturday in Durham was the continued evolution of a sure-fire lottery pick and, to me, the most improved offensive player in the nation. No, I’m not talking about Harrison Barnes. I’m talking about John Henson, who has quietly polished his short and mid range face-up offensive game, which has made him one of the most complete and NBA-ready big men in college basketball. Prior