Did u watch the video? He showed Peppers didn't struggle in coverage.
Okay, I watched the video. I had read/watched reports earlier that suggest his tape suffered in 2016 as a result of what he was asked to do, so that wasn't a surprise. But what this video did was define specifically where he struggles in coverage. In man-coverage, he is good; he struggles in zone. That, believe it or not, for the Cowboys is a much bigger issue. Marinelli's defense is zone-based; meaning that the majority of what they do requires zone coverage on the back end; and this becomes especially important when they blitz. Again, I still believe he could be an improvement over Church; his athleticism alone all but guarantees it. But even Church was a liability in coverage and I believe that is a part of the reason the Cowboys let him walk.
According to the video, Peppers job in their defense was to set the edge; prevent offenses from capturing the edge, forcing the running back into the teeth of their defense. And it worked very well. My question is how does Peppers perform when he asked to do that and a whole lot more. In Marinelli's defense, there will be times when he asked to do just that; set the edge. But, more often than not, what he is asked to do will depend on the offenses alignment. From one play to the next, he will be asked to do something different. One minute he will carry the RB out of the back field, the next he will slide back into zone to prevent the quick pass, the next he will have to react to a different rule of engagement. Personally, as Safeties go, I'd prefer Obi Melinfonwu; ideally following a small trade down from 28 into the top of the second, to pick up extra picks. As of right now, Jabrill may be the better all-around football player, but Obi is the safer pick all things considered. And in 3 years, paired with Byron Jones, the Cowboys may have one of the best Safety tandems in the NFL. And this all assumes that none of the top-tier corners, defensive ends, or offensive lineman fall to them at 28...because if they do, I don't believe either Jabrill or Obi will even be in the warroom conversation.