There's still free agency. How can people not understand this? If they aren't drafting someone now, they still have the chance to find someone in free agency. Yeah, they might not find someone like who will be dominant like Demarcus Ware or Terrell Suggs in FA, but they can still find a player who can complement the current roster of OLB that may solidify a weakness. Plus a veteran most likely won't have as much of a learning curve as a rookie would.
Oh and when they took two RBs earlier in the draft, it meant that they had those players rated higher at a position of need than they had any of the OLBs at that point. Plus I'd love to see all of these OLBs available in the 3rd round that people keep saying would have instantly started. So slick, how about you start listing off the OLB who are guaranteed to make an impact right away like you and everyone else keep implying they would have. Guess what, you can't. However, a RB can have an impact even though he'll be the 4th on the depth chart since he has much less of a learning curve than someone switching from DE to OLB and RB is a position where you can't have enough guys do to players being banged up. Just ask the Saints last year when Thomas and Bush both went down for long periods.