You have to feel good about the offensive line going into next year not just because of TL, but from the vast improvement of the run game in 2020.
Leistikow projects the starting 5 to be LT-Kallenberger, LG-Ince, C-TL, RG-Schott, RT-Plumb. That makes sense based on what we saw this past year. If any backups were to jump to the first team it would be Britt at RG (I think Ince is more solidly a starter than Schott). It depends how much Britt has advanced but he seems to have the physical tools already. Cronk might be back too since he did not have a healthy or great season. DeJong, Elsbury, Richman will all get snaps. Maybe a true freshman like Davidkov who is already huge could get snaps too.