The linebackers, despite Andre Carter's prior struggles and discomfort in a two point stance, are all reasonably well suited for this type of 3-4. Fletcher and Riley could play either ILB position. McIntosh isn't a terribly poor fit in a 1-gap RILB role. HB Blades could probably do okay at either spot, too.
Jene, there is discussion in the Redskins team thread regarding the LBs, but 'Skins fans are generally unfamiliar with all that's involved in a 3-4 defense (myself included).

With the talk of all the struggles Carter had in SF, presumably with the coverage aspects of playing LB, there is a lot of concern that OLB is still an area of need. Are you saying you think Carter and Orakpo could adequately handle both OLB spots? How important are the coverage responsibilities of a 3-4 OLB? Both Carter and Orakpo seem like their skills mirror the Demarcus Ware OLB position (i.e. speed rushers). Is it normal for both the OLBs on other 3-4 teams to have such similar skill sets?I could probably list a dozen more questions, but I'll hang up and listen now.
Ideally, most 3-4 fronts would probably like to have a pure edge rushing type at ROLB that was athletic enough to fluidly drop into zone coverage as a changeup now and then. For the most part, though, that player functions as a pass rusher in almost all of today's 3-4 fronts. In the 1980s, that OLB was tasked with plenty of coverage duties. Those 3-4 schemes rushed three much more often than today's 3-4 fronts. People think of LT as a stud pass rusher, but he was amazing in coverage as well. On the other side, you'd ideally have a stronger all-around linebacker. Someone who could set the edge against the run and maybe run with a TE in man coverage reasonably well -- all while still very capable in pass rush. The coverage deal is again secondary, though, as most teams will run some form of zone on that side anyway.I think you're probably correct that both Carter and Orakpo are probably better suited to the ROLB than LOLB. I do think, though, that both would do fine supporting the run on the left side and both should be athletic enough to drop into a shallow zone and close on an underneath route now and then -- Orakpo probably better than Carter at this stage in their careers. I don't specifically recall, but I think Carter's issue in San Francisco was that his pass rush suffered because he wasn't getting the same burst at the snap from a two point stance. He may also have struggled with run-pass reads and the resulting hesitation hurt him.Essentially, you work with what you have. Ware is better than most think in coverage and can be moved around formations. James Harrison and Lamarr Woodley are a lot alike -- neither are pure edge rushers, both are decent dropping into zones. It'd be nice to have a pair Terrell Suggs and Adalius Thomas in their primes or two all-around interchangeable types like Willie McGinest/Mike Vrabel, but I think Carter and Orakpo would be at least serviceable.