Exactly.
We've been down that road before. No thanks. Works for a little bit, then teams scheme against it and expose it for its inherent weaknesses.
Pollard is a short-yardage guy. When the offense is on its own end of the field, facing a 3rd and short...you put a SS like Pollard in there to police the area.
If that offense is moving down the field, and getting into scoring range, a SS like Pollard is dead meat most of the time. Always looking for the big hit, getting caught looking in the wrong places, and too slow to recover and make up for lost ground.