I may forget someone here, but you guys can fill in the blanks.
In two seasons, I expect Manti to be gone of course, neither Carlo nor Dan Fox to be asked back [maybe Fox], Danny Spond another available player but still a maybe as to field time if he performs without injury, and Kendall Moore and Justin Utupo either not playing much [KM] or moved into DE [JU]. I believe that Romeo might have outgrown CAT by then also. We need to remember that unless we do a lot of speed experimenting at OLB [which would be fine with me] that, if we cannot count players like Baratti and Shumate as "sort-of" Slaughter-like LBs, we essentially whiffed at linebacker last year. That alone should give the intuition that in the staff's mind they should "go heavy" at LB this time around.
Say that two seasons from now we line up a four-man LB array like Shembo [CAT]/ Grace [MIKE]/ Councell [DOG]/ and "someone" [WILL]. Other playable linebackers on the team would be Rabasa, maybe Spond, maybe Fox, Ishaq as sharing CAT with The Prince, Moore, and whoever these 2013s LBs are as frosh [Hint: an EE might have a GREAT chance to play right off].
Let's imagine a numerical worst case scenario in which none of Carlo nor Fox are asked back, and Kendall and DannyS can't cut it for their different reasons. And Justin and Romeo look out-of-place at LB. Diaco then has Prince, Ishaq, Jarrett, Ben, Anthony, ONLY, as guys that he might be really comfortable with for long periods of game time. Adding young superstuds to that would seem to be VERY desirable. JSmith could step right in, especially if he would be happy to play WILL, or Ben shift over. Or a guy like Anzalone could step right in, especially if Rabasa wouldn't quite fit the bill, though I think Anthony has BIG potential in the middle somewhere. Adding Deeb as a Grace back-up, and both Mattingly and Randolph as understudy DOGs and WILLS with plenty of early potential playing time, seems almost a necessity.
Five LBs this cycle, if they are all good ones, gives Diaco 10 potentially playable athletes there two years out if Spond, Moore, Utupo, and Fox are not seriously in that mix. And one should remember that high school credentials don't always translate into "championship" linebacker play [ can you say "Filer"?]. I very much hope that we get five very good LB prospects this cycle. And if everybody shines, well, Mattingly may just become another hero of "Tight End U" when it's said and done.