If they really feel like he is the best guy for it,and he isn't starting over Jenkins/Carr (even though I realize 3rd CBs are basically starters now) he should do it.
People always talk about the injury risk associated with being a return man, but look around the NFL at top return men. Devin Hester, how many big games has he missed due to injury? He has missed a total of 4 games in 6 years, despite being a return man for most of his career. Josh Cribbs, how many games has he missed due to injury? 4 games in 7 years, despite being the primary returner for his team. Tedd Ginn Jr? A total of 4 games in 5 years.
My point is, the risk of injury is always there, every down in football. But I think we overrate the injury risk. Just because Dez got hurt on a freak injury returning a kick doesn't mean that the risk is astronomical.In special situations the reward outweighs the risk. Just IMO.