Yeah but we are in search of our next true OB1. He has been inactive most of the year. I don't think the team feels he is ready or capable of winning games for now. Although Siemen has been bad, the team will still stick with him regardless. Not going to put a raw rookie out there just to see what he got.
That and the fact Hill has a finger injury and Book still is inactive, the way this season is going Book has no real help on offense and would get killed so Payton is going with his known commodities rather than his unknown commodity in Book.