Tim Cowlishaw, sports columnist for SportsDayDFW.com and The Dallas Morning News, author of Drunk on Sports and panelist on ESPN's "Around the Horn," answered your questions about the Cowboys, Rangers, Mavericks, Stars and college sports in his reader mailbag. Here are some highlights. What's the biggest hurdle between the Big 12 and representation in the College Football Playoff?Cowlishaw: Michigan and Notre Dame.