I feel like we have a pretty big list of defensive backs: Baity, Beckham, Blaylock, Edwards, Harmon, Jackson, McClain, McWilson, Randolph, Tucker, Walker, West, and Westry.
So, on the two deep you'd have:
CB1: Westry/Harmon
CB2: Baity/Randolph
NB: McClain/Randolph
S: Edwards/West
S: McWilson
I am not exactly sure how the staff will shake out the safety positions. Last year McWilson backed up Edwards while West backed up Stamps. This year they very well could move the safeties around and start Edwards and McWilson, or they could leave McWilson as Edward's backup and move West into the starting role. West didn't start any as a freshman while McWilson started in 9 games and Edwards started in 5. That leads me to think that the staff will likely move McWilson up and leave West as a backup. Also coming into the fold is one hell of a safety prospect, Marcus Walker. ESPN had him as a 4 star recruit and a top 250 player who had offers from a ton of big time schools. He took a redshirt last year, but it is going to be extremely hard to keep him off the field this year. He may push for a starting job.
Still, we have some backup roles that can and likely will be filled by others. Randolph doesn't need to backup two positions and Harmon isn't exactly lockdown. Jackson is a 6'3" redshirt freshman that the staff should like a lot because of his height. You have to imagine that he'll see some time on the edges this year. Beckham is another corner that is probably more suited for the NB position. He may take that role as a backup and allow Randolph to play a bit more on the edges.
Coming in you have Griffin, Gilliam, and Robinson. Hughes is also a likely candidate. Most of these guys project to be corners. If I had to guess at least one of them is going to be a player that contributes from the word go. If I had to guess it likely comes down to Griffin and Robinson. Whoever puts on some more good solid weight and wins out in fall camp will probably be the guy that ends up playing and the other will likely redshirt.
Of course, this is all just my lowly opinion.