Rick Cartman
It is what it is
I think the modern NFL has moved away from traditional defensive schemes to cope with 3WR/1TE base sets on offense. DBs in general have become a premium position. Safeties are asked to play more versatile roles (in the box or slot), but there is still almost always at least 2 on the field. If you go back and watch the game originally mentioned vs Indy you will see McCain and Rowe on the field together most of the defensive snaps. LBs however, are a dying breed. A good box safety and MLB is pretty much all you need anymore (ignoring EDGE rushers).
It also would explain why guys that don't necessarily have a real position like Derwin James and :shivers: Minkah Fitzpatrick are thriving the last few seasons. In addition to the aforementioned, LBs like Deone Buchanon and Deoin Jones have been effective despite probably being sized like a 1987 Strong Safety.