Gay and Sneed are still getting up to speed with the fucked up offseason but yes, both can be starting caliber guys.. Fenton... I think his ceiling is rotation guy who is matchup dependent. Should probably be the 4th or 5th corner.
Saunders can play. He's stuck behind 2 better players though, plus Wharton, who is a freak still learning to play. The good thing with Saunders is he has some versatility to his game (can play nose, 1 tech, 3 tech). The bad news is, when everyone is healthy, you might be better off with specialists behind your starters. Thats how its played out with Wharton (pass rush specialist) and Pennel (run specialist).