
Frank Ross has a limited amount of players on the 53-man roster he can work with to form his special teams units which cover kickoffs, punts, returns, and field goal tries and blocks.
Typical Ross is working with reserves on the Houston Texans roster. When injuries hit, those reserves are tapped, as was the case in Week 14 when cornerback Tremon Smith was called upon due to cornerbacks Derek Stingley and Steven Nelson being out. Same went for receiver Chris Moore as Brandin Cooks and Nico Collins missed the game.