When Manusky sends Willis up the middle, the OLBs get pressure. Generally though, they basically play the role of a 4-3 DE. Either one, or both of them, rush on the edge and take on the OT, one-on-one.
I'd consider Manny and Haralson average OLBs, nothing special. As long as Manusky sends pressure up the middle, they'll be fine. I think we'll see more of that as the season goes on. He sent Willis a couple times before Spikes was injured and that was very effective.
A pass rushing specialist would be nice though.