As been posted in other threads, with the resigning of Williams, the starting O-line is likely set now with Dawkins & Williams at the tackles, Boettger and Ford at the guards and Morse at center. However, I think if Feliciano was resigned, he might start over Boettger or Ford and also be a very solid backup at center to move over if Morse got concussed again.
Nsehke and Winters are likely not returning so they need to probably have at least one, if not 2, veteran O-linemen as backups that can play multiple positions.
I guess they could draft a C/G who might be able to start, leaving Boettger or Ford as a backup. I believe Devey is also under contract. Can anyone confirm?