Brandin Cooks....
It's been the case with him since he was drafted and was ultimately why he was traded. He runs with 4.3 speed but can't beat a LB around the edge? And he's so afraid of contact he does stupid things like trying to hurdle the defender when he doesn't have to and then runs around in circles allowing himself to get knocked out of the game by Jenkins.
We expected him to be able to return kicks, run a successful end around and/or bubble screen etc but it turned out he was only good at getting any yards after the catch if he catches a bomb with no one in front of him.