What happened: The Dallas Cowboys are turning to a backup with their usual starter sidelined by a thumb injury requiring surgery.

Why it matters: Coach Brian Schottenheimer said the expected absence is four to six weeks, extending the protection adjustment beyond the opener. [Associated Press](https://www.nbcdfw.com/news/sports/blue-star/cowboys-og-tyler-smiths-thumb-needs-surgery-will-miss-at-least-a-month/4073726/)

What to watch: Watch how the reshaped interior protects Dak Prescott in the opener.