Talan Alfrey, Tanner Wall, Dean Jones, and Connor Ebeling
All of those guys joined the team in January and are 6'2 ish and will play around 200 pounds. All played safety in HS.
If Cosper moves to safety, I would expect BYU to keep Wall at WR. I've said it before, my money is on either Alfrey or Wall being the next great BYU safety.