I will take a shot.
CB:
Chris Fredericks
Scoop Bradshaw
Iffy Melifonwu
Eric Coley
Trill Williams
Fredericks and Bradshaw were quite good last season and I don't see them being beaten out of starting jobs by 2 redshirt frosh or a true frosh. I see Iffy and Eric as the backups and a concerted effort by the staff to redshirt Trill. All three of the young guys are over 6'0. The times, they are a changing.
FS:
Antwan Cordy
Devon Clarke
Carl Jones
Andre Cisco
Cordy is a freak athlete who has had a couple major injuries and some problems with pass coverage, mostly caused by his uber aggressive play. If he is healthy, it is clear he is going to play. Where he will play is not so clear. He has played both safety positions and the nickel. Could well play free safety normally and move to nickel back in passing situations.
Clarke has size and talent and should be over 190 by fall (he is listed at 186 from the fall). Cisco played safety in HS. He played at a powerhouse and is an early enrollee, which will help him. You would think Clarke would have a big advantage in experience over Cisco given he has been on campus for two years. But he hasn't practiced much.
Thought Carl Jones looked lost at safety late in the season. Maybe they move him back to CB.
Anyway, I think Cordy starts, with Clarke or Cisco as the backup. Whoever is the backup is likely to play a lot in nickel and dime situations.
SS:
Evan Foster
Cam Jonas
Rodney Williams
Allen Stritzinger
Foster is the returning starter and looked good for the first part of the season. His performance deteriorated in the second half, and at least part of the problem was probably because he was tired and/or banged up. He made some good plays and some bad ones. I don't think it is a given he returns as the starter, but there is no player well positioned to take the spot away from him, so it probably won't happen.
Cam Jonas played against top competition in HS and did so at a high level, but he missed his senior season with a knee injury. He is on campus early, not sure if he will be cleared to play. My guess is he will not be allowed to participate in contact drills in the spring. I think he is most talented player in the group and probably will break into the starting lineup at some point in 2018. Rodney Williams is a little small and a little slow but has a big heart. Don't know if Stritz is moving to defense. He is still listed as an RB on the roster. If he does, I think he gets assigned to the strong safeties and will battle Jonas for the future starting job at SS.
I see Jonas as the future SS. Really love his tape. If he doesn't start there, it is probably because he ends up starting at FS instead.