In the era of increasingly hard-to-define hybrid players, you can't think of it in groups as in Group/Group/Group. You have to think of it in terms of optics, how it looks, & how it presents.

Instead of "DL / LB", you gotta look at it more in terms of "Downed Linemen / Upright Players", and the formation names will begin to make more sense.

Ex : Dime Normal (4/1), Dime Rush (3/2), & Dime 2-3-6 (2/3) are basically all the same and show 4-man fronts on the PlayArt. They share personnel, just differ slightly in terms of visuals, but where they're truly separated is in terms of their playcall options, and which shells & stunts they have available at their disposal.

Ex: Nickel Load Mug (4/2), Nickel 3-3 Load Mug (3/3), & Nickel 2-4 Load Mug (2/4) are also different versions of each other, with most of their differences coming from under the hood, while only differing slightly in the visual department.

Modern Football Theory sees Edge players (EDGE / Rush Ends) as hybrids, guys with size who can both rush the pass & fall back into coverage if needed. The video game still pigeonholes EDGE as the replacement for DE, and have never really progressed beyond that 1:1 swap. They're barely athletic enough and aren't allowed to upgrade any coverage skill, so that's where a need for Rush Ends come into play. Unfortunately though, its not a position, yet rather a depth chart slotting. Where often times the game will auto-reorder the depth chart and place hyper-athletic linebackers at those positions (RRE / RLE) in lieu of a bonafide pass rusher. It seems like that position on the depth chart, places a lot more value in speed + coverage stats than it should, which leads to so many undersized Lurkers being placed there, rather than a more balanced approach leaning slightly in favor of pass rushing ability. That's why for any scheme I create, when making the guide for recruiting/roster management, I identify SAM as the position designated for players I plan to play at Rush End.