Joe Haden ran a 4.6, hasn't stopped him from being a shutdown corner in the NFL. Some guys put up great numbers and can't play football for ****. Some guys put up **** numbers but play football great. When you spend half your time on the field back pedaling, I'm not sure how fast you ran a forty or how many reps you did on the bench matter that much.
If Gunter makes it in the NFL it will be because he studies the game, understands situations, anticipates plays and has hips to get in and out of breaks quickly. Joe Haden is great at all those things, so he's an all pro football player. Demarcus Van Dyke is not, so he is consistently in and out of work on practice squads.