Malik Jackson is still listed as the Broncos' second-team left defensive end behind fellow second-year pro Derek Wolfe. As often is the case with depth charts that's oversimplification starting with the fact that the Broncos will likely again line up in the base 3-4 for only about one-third of their defensive snaps. So far in training camp at least Jackson not only has shown signs of maturation and improvement over his rookie season he also seems to be convincing his coaches of his versatility and trustworthiness at either end or tackle even sometimes on the nose in nickel packages. At 6-foot-5 293 pounds — don't laugh at this — he's not "big" enough to be the coveted space-eater inside against the run but he can put pressure on the passer or cause blocking dilemmas when rushing the passer from the inside. "I usually just call myself a defensive lineman because I like to pride myself on being able to do all that stuff" Jackson said Tuesday. "The more you can do the more chances you have to be on the field. I'm just trying to be better at each position and work my craft every day." Wolfe and Robert Ayers listed as the No. 1 right end also can play tackle in many packages but Jackson is making a case for being used more than the 113 defensive snaps credited to him last season.