I think Brad Biggs at the Chicago Tribune probably has the right of it on the release on tackle Jon Scott:
“The Bears signed Scott after the Week 1 game last season because they did not want to be on the hook for his full season’s salary in the event they decided to make a change. The plan could be to bring him back in a week or two when his knee is healthy. The departure of Scott makes Eben Britton the swing tackle for this week and the foreseeable future.”
There’s no reason to carry Scott on the roster for week 1 if he can’t play. The Bears likely thought it was worth the risk that another team would try to pick Scott up in the meantime. So we will likely see Scott back for week 2 or 3 if all goes according to plan.