Oliver looks like he may be out again this year, Lukas is injury prone, and we don't know when Lewis will be available again. Barnes is probably the most capable Safety of playing corner, but he'd be wasted on the outside because he's such a playmaker and disruptor at Nickel.
The most likely guy to get moved if our numbers are down is probably M. Kelley. I wouldn't be surprised if he's already getting work a CB in camp as we speak.
There is Ashton Hampton, Branden Strozier, Tavon Feagin and Corian Gipson if Oliver, Lukus and Lewis can’t get healthy. That leaves Terrell on the other side to stay healthy. I’m sure they will be ok. Just a little young, but very talented.