The one thing I notice about Oliver is that while he can be disruptive, he often flies into the backfield out of control and fails to finish the play. The QB slides one way or another and Ed flies by. Jerry Hughes used to do this a lot too, screaming off the edge out of control. That's why his pressure rate was so good but he had a hard time finishing the plays.
It's great being disruptive but he needs to play with more control so he can breakdown and finish plays.