Just a few days after agreeing to an extension with cornerback DaRon Bland that will keep him as a cornerstone of the Dallas defense, Jones decided to lock up guard Tyler Smith. Dak Prescott's top pass protector has now been locked in for the future after agreeing to a four-year contract extension. Smith's status as one of the best guards in football made this decision a complete no-brainer. Cowboys agree to four-year extension with left guard Tyler SmithThere was a fair degree of skepticism around the Cowboys' decision to draft a player from Tulsa at No. For the rest of his prime, Smith will have a star on the side of his helmet.