Strong Safety is an interesting position in terms of how it has and still is evolving.
As the NFL became a passing league, FS became the High Paid Safeties.
As passing evolved further with TEs and RBs increasingly in the mix, it became more important to have Strong Safeties that can cover.
Strong Safety continues to be a position where teams can "get by" with limited players because D-Coordinators can scheme around them to some extent; however, having s Strong Safety with quality run and pass defense skills has become a huge
bonus for teams. While DCs can scheme around limited Strong Safeties, it makes the defense more predictable. An elite SS allows the DC to use a multitude of coverage(s) without worrying about the SS getting exposed.
Radical Example of SS evolving from a run stopper to a pass coverage player:
- Jeff Heath
- Pass coverage ability kept him on the field, despite issues in run defense.
- Cowboys could have subbed in Frazier for run defense, but didn't want to be without Heath's coverage ability.