Busy day, I won't be on here much ... But Roberson has a shoulder injury, that's why he isn't on depth chart. He and Tyler Williams are in the same boat: out this week, hopeful (questionable) for Rice, probable for UNC.
Bothroyd has looked like a starting DT since Williams got hurt. I'd imagine Kamara is the third DT in the rotation, but Winter has had a decent camp and his hard work is probably being rewarded with that spot. Kenneth Dicks III at rover was a bit shocking, because he worked at CB all camp. Clawson is really high on the young D-linemen that are going to play a lot (Bergan, Bothroyd, Johns, Francis), with the caveat that it's to be expected they make some Game 1 mistakes.
The one spot that isn't listed is who's handling kickoff duties. That'll be Sciba, with Zach Murphy backing him up.