Someone please correct me if i'm wrong, but I don't believe Donnal has received a single pre-season or regular season snap this year. If so, which game & how many snaps at what position ? There has been little news of his direction since McVay announced early following his hiring that he expected most of the reserve offensive linemen were to be cross-trained. There had been a good deal of speculation about his health status around these parts, although that appeared to end abruptly after he was named to the starting 53 at the end of camp. Still, the guy seems a ghost, ... and so does any media speculation about him. At the end of last season he was thought to have a future being one of the first reserves off the bench at either RT or OG, and the team had brought in several players who received time on the field but didn't get past camp.
The Rams don't seem worried about OL depth at the moment, they haven't raided another teams practice squad or brought up another player for the bench, so maybe I shouldn't worry either, but for some reason I am. The Rams let C/OG Aaron Neary go back to the practice squad when WR/ST's player Mike Thomas returned from suspension, so Blythe & Donnal are seemingly the only others available to fill the spot if necessary. It seems I recall Blythe getting some time in at RG during at least 1 pre-season game, and he did hold his own for his few snaps at the position, he's also had some regular season snaps at center as Sullivan's reserve.
As for Donnal, I don't know what to think other than I liked his potential during the 2016 season, but coming in cold off the bench if Brown is incapable, I do see some reason for concern. If I had to guess, Blythe would be the first guy up, but that guess is only because of the lack of available information. jmo