you may be on to something and others have posted/reported this as a way to counter the new game geared towards the passing offense. BIG on the line, fast behind it.
3 BIG D Linemen eating up space in the middle and taking on blockers
2 'traditional' LBs-right now that would be Milano and Miller who can stop the run, rush the passer and cover a bit
2 Nickel/LB Hybrid tweeners that can cover a TE/slot while supporting the run, Johnson and the rookie or Bernard or Benford?
2 outside corners- we are set
2 safeties- we have 2 of the best