They have a perennial All-Pro Center, an All-Pro RT, and an older but still effective Peters at LT. They're a good Oline when healthy. That said, I agree that the Rams showed only modest pressure from the OLB position. And this might become their Achilles Heel for this D unless they get some guys on the outside to step it up.
I expect to see some different guys get a chance this week. Although in playing Allen, it is not so dissimilar to playing Wilson; gotta be careful to rush under control and keep Allen contained otherwise he'll hurt you with his legs. Pressure in Allen's face, containing pressure from the outside, that'll be more important than sacks this Sunday.