As a general statement, I agree with Mikey's premise. There are 2-3 LB positions and a fairly high wash out rate for LBs between HS and college (it seems to be a difficult position to project, especially as coverage becomes a bigger and bigger part of playing the position). For that reason, it's best to sign 3-4 guys each year to fill the 2-3 positions. That gives you wiggle room to deal with guys not panning out.
However, I also don't think roster decisions are made in a vacuum. We've hit at an inordinately high % lately at that position. Usually, you'd say signing one, two, and three LBs in successive classes, respectively, is undersigning, which will create an issue. Usually. But if those guys are KJ Britt, Chandler Wooten, Zacoby McClain, Michael Harris, and Josh Marsh, and the coaches feel REALLY good about three of them and good about the other two... well, now you have a different outlook on the necessity of signing a big class. I think it's a non-issue because Mikey is saying "Sign three this year" and the coaching staff is saying "We will sign three this year" so they actually agree, but even if we add Owen Pappoe and two projects, I still think we're okay next year if any two of Pappoe, Harris, and Marsh are rotation-level players.
The bottom line is, Britt, Wooten, and McClain are locks for big roles next year, and all three will play a lot this year. If Harris, Marsh, Pappoe or other signees can provide depth, we're good.
It's a bit like Safety. That was a real danger position after last season. Then, Dinson and Thomas stepped up their game, and Monday/Sherwood came in like gangbusters. Now, it looks like a team strength going into next year. Generally, that wouldn't be true with only four guys, but with those four guys, it is. Roster decisions are not made in a vacuum. With those five LBs coming back next year, the pressure on the position is less than you'd expect.