The ILB have to be good at block shedding and stopping the run. One of the. Needs pass rush ability. The OLBs need (IMO) length and edge rush ability... Most 34 rush backers come into the league playing the speed rush. The line is built to were they are space eaters. Large NT in the middle to take on a double. Larger DEs to help stop the run. The LBs flow to the gaps to attack the runner instead of containing them like in a 43.