The Dallas Cowboys have no shortage of stars, from Ezekiel Elliott to Dak Prescott to Demarcus Lawrence to Amari Cooper. Everyone expects those big-time guys to step up and be impactful on the big stage, but it is the unexpected Cowboys that could be the difference between a good team and a great one in 2019-- starting with these three.

3. RB Tony Pollard

Birmingham Bowl - Memphis v Wake Forest

Tony Pollard was drafted in the fourth round out of Memphis this spring, and the rookie running back could be a key component to the Cowboys success in 2019. Elliott has been a workhorse since entering the league, and Dallas hopes that Pollard could be the guy that can give their star back much-needed spells at times this season. He rushed for 552 yards and caught for 448 yards last season, giving Dallas a versatile option out of the backfield.

2. DE Robert Quinn

Buffalo Bills v Miami Dolphins

Robert Quinn once had 19 sacks in a season, and although the Cowboys do not expect that same explosiveness out of the 29-year-old veteran, they should expect Quinn to be Demarcus Lawerence's able counterpart on the other side of the defensive line. Quinn will greatly enhance Dallas' pass rush and will make their defense even more of a team strength.

1. C Travis Frederick

Cincinnati Bengals v Dallas Cowboys

Travis Frederick couldn't participate in the 2018 season due to Guillain-Barre syndrome and was missed dearly along the offensive line. Before missing the campaign, Frederick was a staple for the Cowboys, protecting Prescott from head-on rushes and getting into the second level to block as well. Getting him back not only boosts this team's on-field ability, but also increases team chemistry and morale, a huge lift for the Cowboys.