Edmunds just seems like a step behind the play. Often it feels like he feels his athleticism is enough to get the job done or he gets washed out by an offensive lineman as he doesn't read the play but instead just running to a spot.
a knock on Bernard was his timed speed, he might play faster than it but in the preseason he showed that he wasn't the fastest of guys but think he did better than diagnosing things than Edmunds does.