Ok, take this one with a massive grain of salt. I don't see any other mention to it anywhere, but somebody said they heard on a local Chicago radio station that the Bears will be starting Adrain Peterson. I don't see anything else anywhere, so if I had to guess he misheard the news.
Reading this piece from John Clayton on Ruben Brown moving to IR, says that the Bears decided to move him there, but didn't have to. He had been playing with the same injury for weeks now. It might have been the Bears way of getting younger.
This only makes half sense. If the Bears needed to see if Metcalf could do the job, then you could pull Ruben Brown out and just say he needs a few weeks to let his shoulder mend, but still have him available if Metcalf can't do the job or gets hurt himself.
Despite early reports Nathan Vashar will not be ready to play versus the Raiders.