“Ryan Van Demark: The unheralded, second-year man can lock down the No. 3 or No. 4 offensive tackle spot with a decent-to-good showing. It would be nice if he played well to give the Bills a little added sense of security. Backup tackle is the No. 1 depth concern on the team, aside from quarterback. The 6-foot-7 Van Demark spent all of last season on the practice squad. On the other hand, a shaky showing by Van Demark and/or David Quessenberry could prompt the Bills to take a harder look at the waiver wire for surplus offensive tackles to add to the practice squad, at the least. Chicago is not strong at edge rusher. The Bears ranked 31st in the NFL in sacks per pass attempt last season. In free agency, they added Yannick Ngakoue (9 1/2 sacks last year) and power rusher DeMarcus Walker (seven sacks).’