'Seantrel Henderson started all 16 games at right tackle during his rookie season in 2014, but his 2015 season was cut short by his battle with Crohn's disease. He is still in the process of getting back up to his playing weight and then he has to wrestle the starting job away from Jordan Mills. If Henderson gets healthy, will we see a dramatically improved player? That could be the biggest question the Bills have heading into training camp.'