The Bills need major help at offensive tackle. The line struggled all last season. The retirement of Brad Butler compounds the problem. Chan Gailey indicated the team will look to the draft or free agency. This year’s college class has several outstanding tackles. Prime prospects include Bryan Bulaga of Iowa, Trent Williams of Oklahoma, and Anthony Davis of Rutgers. They may be taken by Buffalo’s ninth overall pick. The Bills must shore up the offensive line, which ranked 29th in the league and allowed the third highest number of sacks.