Offensive line doesn't hold up: When training camp started, the most popular projection of the offensive line included (from left to right) Ronnie Stanley, Alex Lewis, John Urschel, Marshal Yanda and James Hurst. However, Urschel has since retired and Lewis suffered a season-ending shoulder injury. The Ravens also lost rookie fourth-round guard Nico Siragusa to a season-ending knee injury. Yanda was a limited participant for much of training camp after offseason shoulder surgery, and Stanley dealt with some physical ailments that temporarily sidelined him. Poor Hurst, who went from right tackle to left guard to left tackle and back to left guard all in the span of a week. The Ravens added veteran Austin Howard to play right tackle, and they seem content with Ryan Jensen manning one of the interior spots, but they are extremely thin on depth and experience up front. With all the focus on protecting Flacco and running the football, the line is the team's biggest concern by far, and the lack of practice time with the starting group all together this summer is especially worrisome.