Joe Flacco is the Ravens’ undisputed starter at quarterback, but that has not dissuaded Bills coach Sean McDermott from taking some time to study rookie Lamar Jackson. “Well, we understand the threat that he brings when he’s on the field, so we spend a considerable amount of time in preparing for him — as well as Joe Flacco, I should say,” McDermott said. “Joe is a documented Pro Bowl quarterback. Certainly, I have a lot of respect for Joe, first and foremost.” … Rookie inside linebacker Kenny Young (left knee bruise) was upgraded from limited to full participation in the Ravens' injury report Thursday. Cornerback Maurice Canady (thigh) was limited for the second straight day, while for the second consecutive day defensive tackle Willie Henry (hernia surgery) and rookie tight end Hayden Hurst (stress fracture in foot) did not practice. … The Bills are healthy, too. Starting strong-side linebacker Lorenzo Alexander did not practice for noninjury-related reasons. Backup middle linebacker Julian Stanford (nose) practiced on a limited basis Thursday after sitting out Wednesday’s session. For the second straight day, rookie wide receiver Ray-Ray McCloud (knee) did not practice. … The team announced several pre-game festivities for Sunday’s game. Fans entering the stadium will be given an 18-inch by 24-inch Ravens flag, and the defensive starters will be announced during player introductions. The United States Air Force Heritage of America Band Vocal Trio will sing the national anthem, and 75 soldiers and airmen from the Maryland National Guard will hold a 40-yard American flag during the anthem. An American bald eagle named “Challenger” will fly around the stadium and land on the field during the anthem, and a group of A-10 Warthogs from the Maryland Air National Guard will fly over at the end of the anthem.