Buffalo's Week 4 outlook hinges on three starters as Saints visit Highmark. Ed Oliver (ankle), Matt Milano (pectoral) and Spencer Brown (calf) were non-participants, with Brown added to the injury report this week. Oliver has shown progress (no walking boot) but timetable remains unclear; Milano has not practiced since the Jets game; Brown may be held as a precaution, opening the door for Ryan Van Demark to start at right tackle. AJ Epenesa was limited with a pectoral issue. Bills remain 3-0 favorites.