Haven't we been rotating back 7 guys for years now, and had success? I also think that possibly they used this game like a preseason game and played all the guys they could to see what they were made of. A lot of young pups got some good reps(Cavazos, Burke, Watts, Hickman, Ransom and *McCall).
*young for the position
If you look at the schedule, that blueprint doesn't exist with the teams on the schedule. More teams are spread-ish offenses and not power running oriented. It's 1 game, and our real big game on Sept 11 is against a spread offense where that 4-2-5 should be at our advantage. And we don't need 3 great LBs for an NC, we need 2 and a great Bullet, which is what we seem to have in Hickman. Our 4-3 and the 4-2-5 are still quite the same, as the 5 in the 4-2-5 is the LB/S, and that player will benefit us greatly when teams are passing to the RB/TE or even a big slot more.
Hicks and Powers are great additions that will arrive next season, and the way that offenses are designed true LBs aren't needed to solely be run stoppers now, you better be able to cover in space. So only 2-3 LBs are needed in a class and then adding a big S or 2 for the bullet. Getting a kid like Nwakpa would be that guy.