re: How do these guys work for NFL Network

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In a 3-4 you need an OLB, NT, and CB(Depends on the CB v. S) are much more than a DE.

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Close, but not quite.

CBs are needed in any defense, but can actually get more underneath help in a 3-4 depending on the defensive play call, thanks to the positioning of the OLB and a shaded ILB. The most important keys to a 3-4 are a rush / edge stopper at OLB who's also versatile enough to stand up and drop into coverage on occasion, followed by a solid NT who can stand his ground on double teams, then thirdly, the DE/DT position.

DE/DT is indeed primarily a run stopper in a 3-4 but has to be able to set the edge from a 5 tech position should the OLB on his side step into coverage. They have to be big enough to take on Gs & Ts or both, yet quick & strong enough to move to said edge as needed. Basically, its a slightly undersized but slightly quicker 4-3 DT or a tall, thick 4-3 DE, aka Jackson.

Every down lineman in a 3-4 is responsible for 2 gaps, not one, meaning they have to be able to hold their ground on linemen, make reads, and shed to make a tackle. These guys are hard to find ( but typically not as hard to find as an elite pass rushing 4-3 DE ), hence why so many analyst have 3-4 type dlinemen so high in their draft, namely Jackson.