Kevin Sherrington, sports columnist for SportsDayDFW.com and The Dallas Morning News, answered your questions about the Cowboys, Rangers, Mavericks and local college sports in a live chat. Thursday. Here are some highlights.Does Luka Doncic do anything that surprises you anymore? It seems like every night he does something we haven't seen yet, in addition to his patented step-back.Sherrington: Well, I think what we're seeing now is that he's probably hitting a wall, physically and mentally.