Could Commanders be shorthanded at critical position in Week 1?

What happened
We know Dorance Armstrong is out for Week 1. Could Odafe Oweh also be out? That could be problematic for Washington.
Summary assembled by rule from the sources below

We know Dorance Armstrong is out for Week 1. Could Odafe Oweh also be out? That could be problematic for Washington.
Summary assembled by rule from the sources below