I never had a problem with Chung’s hard hits, if anything he was flying around with too much reckless abandon. The problem is that his playing style and body type added up to a lot of injuries.
If injuries mount, and Chung is healthy and makes the team, I could see him playing the Cover 1 Robber role that Gregory played last year. When he wasn’t forced into coverage, and he spent significant time playing the slot corner role in his earlier stint, he was exposed.
He also didn’t have great range to be a back end safety. But coming downhill against the run or to tackle the receivers he’d be okay.
However, I think Chung’s either special teams or bust this year unless there are major injury issues in camp in the secondary.