How I think it plays out IMO:
CB: Ward (guaranteed starter), Okudah, Norwood, Williamson (I feel fairly confident Okudah will find himself in the two-deep here, but nothing is guaranteed)
CB: Arnette OR Sheffield, Burns, Davis
SS: Smith OR Jordan Fuller, Wade, Wint (read a lot of people saying that Wade's best position might be safety)
FS: Webb (was picked on as the weakest link in the secondary last season, but how often do players lose their starting job under Meyer? He'll be the guy, and hopefully improves), Riep (moves to safety)
I'm also assuming Pryor moves to SLB to fill the spot vacated by White (due to the mass exodus of WRs this offseason) but that might not happen.
Following the 2017 season Ward goes pro as all 3rd year #1 OSU CBs do, Sheffield says he's one and done, and Webb graduates. Leaving Okudah and Arnette / Burns as your 2018 CBS, and Wade and Fuller as your likely 2018 safeties.
I think one confusing thing about how OSU plays their safeties is their naming and their responsibilities. I'm fairly certain that the FS in this system is the coverage safety, essentially a nickel CB. This is the position that Bell played. The SS is the safety they have playing deep in single high coverage, but that may have mainly just been 2016 to take advantage of Hooker's ridiculous range. The point is I'm pretty sure Webb was the FS and Hooker was the SS last season, even though that seems ass backwards.